Question

Find the derivative: (sinx cotx)/cosx

Answer 1

use a simple trig identity first
write everything in terms of sine and cosine, then cancel way

Answer 2

in other words, it is a trick
do not take the derivative until you have realized that this is just the number 1

Answer 3

oh i see now so the derivative of 1 would be 0

Answer 4

thanks that was really helpful!