Identify Function: Identify the function to differentiate.We are given the function y=−2sin(2x) and we need to find its derivative with respect to x.
Apply Chain Rule: Apply the chain rule for differentiation.The chain rule states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function. In this case, the outer function is −2sin(u) where u=2x, and the inner function is 2x.
Differentiate Outer Function: Differentiate the outer function with respect to the inner function u. The derivative of −2sin(u) with respect to u is −2cos(u), because the derivative of sin(u) with respect to u is cos(u) and we have a constant multiplier of −2.
Differentiate Inner Function: Differentiate the inner function with respect to x. The derivative of 2x with respect to x is 2, because the derivative of x with respect to x is 1 and we have a constant multiplier of 2.
Apply Chain Rule: Apply the chain rule by multiplying the derivatives from Step 3 and Step 4.(dxdy)=(−2cos(u))×(2) where u=2x.
Substitute Back: Substitute u back into the equation to express the derivative in terms of x.dxdy=(−2cos(2x))×(2)=−4cos(2x).