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Directional Derivative Video Lecture | Mathematics for Competitive Exams

FAQs on Directional Derivative Video Lecture - Mathematics for Competitive Exams

1. What is the directional derivative in mathematics?

Ans. The directional derivative in mathematics measures the rate at which a function changes in a particular direction. It provides information about the slope of a function along a specific vector direction.

2. How is the directional derivative calculated?

Ans. The directional derivative of a function f(x, y) at a point (a, b) in the direction of a unit vector u = (u1, u2) is calculated using the formula: D_u f(a, b) = ∇f(a, b) · u, where ∇f(a, b) represents the gradient of the function at the point (a, b).

3. What does the directional derivative represent geometrically?

Ans. Geometrically, the directional derivative represents the slope of the tangent line to the graph of a function in the direction of the given vector. It indicates how the function changes as you move along the direction specified by the vector.

4. Can the directional derivative be negative?

Ans. Yes, the directional derivative can be negative. The sign of the directional derivative indicates the direction of the change. A negative directional derivative implies that the function is decreasing along the given direction.

5. How is the directional derivative used in real-life applications?

Ans. The directional derivative is used in various real-life applications, such as physics, engineering, and computer graphics. It is used to analyze the rate at which physical quantities change in specific directions, optimize functions in optimization problems, and determine the direction of steepest ascent/descent in computer graphics for shading calculations.

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Sep 23, 2025 Last updated

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	Mathematics for Competitive Exams 98 videos\|34 docs\|32 tests

Mathematics for Competitive Exams

98 videos|34 docs|32 tests

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