Question

what is the derivative of y=cos^2(x)

Answer 1

2Cos(x)*(-Sin(x))

Answer 2

\[y=(\cos(x))^2\]

Answer 3

Are there any other forms?
I thought there were some formulas to memorize.
I used the product rule (cos(x)) (cos(x))
or I used the chain rule

Answer 4

Power rule
[(f(x))^a] ' = a*(f(x))^(a-1)*f '(x)

Answer 5

thanks :)