What is the derivative of (4secxtanx)? a. 4(sec(x)^2 * tan(x) + sec(x)^3) b. 4(sec(x) * tan(x)^2 + sec(x)^3) c. 4(sec(x)^2 * tan(x) - sec(x)^3) d. 4(cot(x)^2 * tan(x) + 4sec(x)^2 * tan(x) e. 4cot(x)^2 * tan(x) + 4sec(x)^2 i have been trying to do this question for a while now and keep getting an answer of 4sec(x) * tan(x)^2 + 4sec(x)^3 by the product rule. i can't see how any of the answers in a-e are equivalent. is my answer wrong?