Derivative of cos(x) at x = pi/2?
Derivative of cos(x) at x = pi/2?
Approach: Derivative is -sin(x). Evaluate at pi/2.
-1. -sin(pi/2) = -1.
Follow-up: What is the derivative at x = 0?
Key concepts: trig differentiation.
Derivative of cos(x) at x = pi/2?
Approach: Derivative is -sin(x). Evaluate at pi/2.
-1. -sin(pi/2) = -1.
Follow-up: What is the derivative at x = 0?
Key concepts: trig differentiation.