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JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced PDF Download

2023


Q1: Let Q be the cube with the set of vertices {(x1, x2, x3) ∈ R3: x1, x2, x3 ∈ {0, 1}}. Let F be the set of all twelve lines containing the diagonals of the six faces of the cube Q. Let S be the set of all four lines containing the main diagonals of the cube Q; for instance, the line passing through the vertices (0, 0, 0) and (1, 1, 1) is in S. For lines ℓ1 and ℓ2, let d(ℓ1, ℓ2) denote the shortest distance between them. Then the maximum value of d(ℓ1, ℓ2), as ℓ1 varies over F and ℓ2 varies over S, is :      [JEE Advanced 2023 Paper 1]
(a) 1√6
(b) 1√8
(c) 1√3
(d) 1√12
Ans: 
(a)
JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

DR'S of OG = 1, 1, 1
DR'S of AF =−1, 1, 1
DR'S of CE = 1, 1, -1 
DR'S of BD = 1, -1, 1 
Equation OG JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

Equation of AB JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

Normal to both the line's
= JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

2022


Q1: Let JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced Let g : [0, 1] → R be the function defined by 

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

Then, which of the following statements is/are TRUE ?
(a) The minimum value of g(x) is 27/6
(b) The maximum value of g(x) is 1 + 21/3
(c) The function g(x) attains its maximum at more than one point
(d) The function g(x) attains its minimum at more than one point             [JEE Advanced 2022 Paper 2]
Ans:
(a), (b) & (c)

Given,

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

This is a infinite G.P.

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
Given x ∈ [0, 1]
We know,

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

We know, AM = GM when terms are equal. 

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
∴ Option (A) is correct
And option (D) is wrong as at only at a single point x = 1/2, g(x) is minimum.
Now, JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

We already found that at x = 1/2 g(x) is minimum. 

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
Similarly, g′(x) < 0 when x < 1/2
If we put it in number line we get this

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

We know g′(x) represent slope of curve g(x) and it is negative when x < 1/2 and positive when x > 1/2 and zero when x = 1/2
∴ Graph of g(x) isJEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

From graph you can see value of g(x) is maximum either at x = 0 or x = 1 in the range x ∈ [0, 1]. 
JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
∴ We get maximum value at x = 0 and x = 1 both.
∴ B and C options are correct.

2020


Q1: Consider the rectangles lying the region

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
and having one side on the X-axis. The area of the rectangle which has the maximum perimeter among all such rectangles, is 
(a) 3π / 2
(b) π
(c) JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
(d) JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced                    [JEE Advanced 2020 Paper 1]
Ans:
(c)
Given region is

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced and JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

On drawing the diagram,
Let the side PS on the X-axis, such that P(x, 0), and Q(x, 2sin(2x)), so length of the sides JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced and PQ = RS = 2sin 2x.

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

∴ Perimeter of the rectangle

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

For maximum, dy / dx = 0
JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
 At x = π/6, the rectangle PQRS have maximum perimeter.
So length of sides 

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
 Required area = π/6 x √3 = JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

2019


Q1: Let f : R  R be given by f(x) = (x − 1)(x − 2)(x − 5). Define

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
Then which of the following options is/are correct? 
(a) F(x) ≠ 0 for all x ∈ (0, 5)
(b) F has a local maximum at x = 2
(c) F has two local maxima and one local minimum in (0, ∞)
(d) F has a local minimum at x = 1                         [JEE Advanced 2019 Paper 2]
Ans:
(a), (b) & (d)
Given, f : R  and
f(x) = (x  1)(x  2)(x  5) 
Since, JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
So, JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

According to wavy curve method

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

F'(x) changes, it's sign from negative to positive at x = 1 and 5, so F(x) has minima at x = 1 and 5 and as F'(x) changes, it's sign from positive to negative at x = 2, so F(x) has maxima at x = 2.

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

 AT the point of maxima x = 2, the functional value F(2), = −10/3, is negative for the interval, x (0, 5), so F(x)  0 for any value of x (0, 5),
Hence, options (a), (b) and (d) are correct. 

Q2: Let, JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
Let x1 < x2 < x3 < ... < xn < ... be all the points of local maximum of f and y1 < y2 < y3 < ... < yn < ... be all the points of local minimum of f.
Then which of the following options is/are correct? 
(a) |xn − yn|>1

(b) xn+1 − xn > 2 for every n
(c) x1 < y1
(d)JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced for every n                   [JEE Advanced 2019 Paper 2]
Ans:
(a), (b) & (d)
Given,
JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

Since, for maxima and minima of f(x), f'(x) = 0

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

is point of local minimum.

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

is point of local maximum.
From the graph, for points of maxima x1, x2, x3 .... it is clear that 

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

From the graph for points of minima y1, y2, y3 ....., it is clear that 

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

Hence, options (a), (b) and (d) are correct.

2018


Q1: For each positive integer n, let JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced
For x R, let [x] be the greatest integer less than or equal to x. If JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced, then the value of [L] is _______.             [JEE Advanced 2018 Paper 1]
Ans: 1
We have,

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

[by using integration by parts]

JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced

The document JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives | Mathematics (Maths) for JEE Main & Advanced is a part of the JEE Course Mathematics (Maths) for JEE Main & Advanced.
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FAQs on JEE Advanced Previous Year Questions (2018 - 2023): Application of Derivatives - Mathematics (Maths) for JEE Main & Advanced

1. What is the application of derivatives in JEE Advanced?
Ans. The application of derivatives in JEE Advanced involves using the concept of derivatives to solve various types of problems related to rates of change, optimization, and graph analysis. It helps in finding the maximum and minimum values of functions, determining the rate at which a quantity is changing, and analyzing the behavior of functions using their derivatives.
2. How are derivatives applied to find the maximum and minimum values of functions in JEE Advanced?
Ans. To find the maximum and minimum values of functions in JEE Advanced, derivatives are used. The critical points of a function, where the derivative is either zero or undefined, are first determined. Then, the first and second derivative tests are applied to these critical points to determine whether they correspond to maximum or minimum values. By analyzing the sign changes of the derivative and the concavity of the function, the maximum and minimum values can be identified.
3. Can derivatives be used to determine the rate at which a quantity is changing in JEE Advanced?
Ans. Yes, derivatives can be used to determine the rate at which a quantity is changing in JEE Advanced. By finding the derivative of a function representing the quantity with respect to time or another variable, the derivative represents the instantaneous rate of change of the quantity at any given point. This concept is particularly useful in problems involving motion, growth, or decay, where the rate of change is of interest.
4. How can derivatives be applied to analyze the behavior of functions in JEE Advanced?
Ans. Derivatives can be applied to analyze the behavior of functions in JEE Advanced by examining their increasing and decreasing intervals, as well as their concavity. The sign of the derivative indicates whether the function is increasing or decreasing, while the second derivative determines the concavity. By analyzing the sign changes of the derivative and the concavity, critical points, inflection points, and the overall behavior of the function can be determined.
5. What are some common types of problems involving the application of derivatives in JEE Advanced?
Ans. Some common types of problems involving the application of derivatives in JEE Advanced include optimization problems, related rates problems, curve sketching problems, and problems involving motion or growth/decay. These problems often require finding maximum or minimum values, determining rates of change, analyzing the behavior of functions, or solving real-life application problems using the concepts of derivatives.
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