Given Function: We are given the function f(x)=3csc(3x) and we need to find its derivative f′(x). The csc(x) function is the reciprocal of the sin(x) function, so csc(x)=sin(x)1. The derivative of csc(u) with respect to u is −csc(u)cot(u), where cot(u) is the reciprocal of tan(u), or f′(x)0. We will use the chain rule to differentiate f(x)=3csc(3x), where the outer function is f′(x)2 and the inner function is f′(x)3.
Derivative of Outer Function: First, let's find the derivative of the outer function with respect to u, which is 3csc(u). The derivative of csc(u) is −csc(u)cot(u), so the derivative of 3csc(u) is −3csc(u)cot(u).
Derivative of Inner Function: Next, we need to find the derivative of the inner function u=3x with respect to x. The derivative of 3x with respect to x is 3.
Apply Chain Rule: Now, we apply the chain rule, which states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function, multiplied by the derivative of the inner function. Therefore, f′(x)=−3csc(3x)cot(3x)×3.
Simplify Expression: Simplify the expression for f′(x) by multiplying the constants together. f′(x)=−9csc(3x)cot(3x).
More problems from Find trigonometric ratios using multiple identities