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Let and denote the area of region bounded by f(x) and the X-axis, when varies from -1 to 1. Which of the following statements is/are TRUE?
I. is continuous in [-1, 1]
II. is not bounded in [-1, 1]
III. is nonzero and finite
Detailed Solution for Test: Calculus- 1 - Question 1
III. True. An area is always positive, while the definite integral might be composed of several regions, some positive and some negative. A definite integral gets you the net area, because any part of the graph that is below the x-axis will give you a negative area. So, a definite integral is not necessarily the area under the curve, but the value of the area above the x-axis less the area under the x-axis. So, A is non-zero and finite.
Which one of the following functions is continuous at x = 3?
Detailed Solution for Test: Calculus- 1 - Question 3
For continuity, Left hand limit must be equal to right hand limit. For continuity at x = 3, the value of f(x) just above and just below 3 must be the same.
A. f(3) = 2. f(3+) = x - 1 = 2. f(3-) = (x+3)/3 = 6/3 = 2. Hence continuous.
B. f(3) = 4. f(3+) = f(3-) = 8 - 3 = 5. So, not continuous.
C. f(3) = f(3-) = x + 3 = 6. f(3+) = x - 4 = -1. So, not continuous.
D. f(3) is not existing. So, not continuous.
A function f(x) is continuous in the interval [0,2] f(0) = f(2) = -1 and f(1) = 1. Which one of the following statements must be true?
Detailed Solution for Test: Calculus- 1 - Question 4
Let's define a new function g,
g(y) = f(y) -f(y+1)
Since function f is continuous in [0,2], therefore g would be continuous in [0,1] g(0) = -2, g(1) = 2
since g is continuous and goes from negative to positive value in [0,1]. therefore at some point g would be 0 in (0,1).
g=0 ⇒ f(y) = f(y+1) for some y in (0,1)
Let f(x) be a polynomial and be its derivative. If the degree of is 10, then the degree of
Detailed Solution for Test: Calculus- 1 - Question 6
F is some function where the largest even degree term is having degree 10. no restiction on odd degree terms.
since f(x)+f(-x)= degree 10
even power gets converted to odd in derivative.
then the the degrre of required expression =9.
the odd powers in F will become even in derivative and G(X)-G(-X) retains only odd powers.
Consider the following two statements about the function
P. f(x) is continuous for all real values of .
Q .f(x) is differentiable for all real values of .
Which of the following is TRUE?
Detailed Solution for Test: Calculus- 1 - Question 7
f(x)=|x| here for all values of x, f(x) exists. therefore it is continuous for all real values of x. At x=0, f(x) is not differentiable. Because if we take the left hand limit here, it is negative while the right hand limit is positive.
where denote the derivative of f with respect to θ. Which of the following statements is/are TRUE?
Detailed Solution for Test: Calculus- 1 - Question 10
We need to solve this by rolle's theorem, to apply rolle's theorem following 3 conditions should be satisfied:
1) f(x) should be continuous in interval [a, b],
2) f(x) should be differentiable in interval (a, b), and 3) f(a) = f(b)
If these 3 conditions are satisfied simultaneously then, there exists at least one 'x' such that f '(x) = 0
So, for the above question, it satisfies all the three conditions, so we can apply rolle's theorem, i.e, there exists 'at least one' theta that gives f '(theta) = 0
Also, the given function is also not a constant function, i.e f '(theta) ≠ 0
So, answer is C
Detailed Solution for Test: Calculus- 1 - Question 13
f you consider x=0 then cosx=1
now if x= PI/4 = 0.785 then cosx=0.7071
for some x value x=cosx
after this x is increasing and cosx is decreasing. so we can say exactly 1 solution.
It is very easy to show that the equation x = cos x has a unique solution. For example take f(x) = c - cos x and notice that (equality holding in isolated points) so f(x) is strictly increasing and hence the equation can have at most one solution.
At and function is continious (difference of two continuous functions is continuous). Therefore there is solution in , hence there is a solution in [0,π]
Detailed Solution for Test: Calculus- 1 - Question 15
as f(xi).f(xi+1) <0
means one of them is positive and one of them in negative . as their multiplication is negative
so when you draw the graph for f(x) where xi<=x<=xi+1. Definitely F(x) will cut the X- axis.
so there will definitely a root of F(x) between xi and xi+1
Detailed Solution for Test: Calculus- 1 - Question 18
Put x - π = t then limit 0 changes to - π and upper limit 2π changes to π.
Integration of t2 for limit to . One is an odd function and one is even and product of odd and even functions is odd function and integrating an odd function from the same negative value to positive value gives 0.
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