/ 2\ \3 / (cos(x))
/ / 2\\ d | \3 /| --\(cos(x)) / dx
Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
The derivative of cosine is negative sine:
The result of the chain rule is:
Now simplify:
The answer is:
/ 2\ \3 / -9*(cos(x)) *sin(x) ---------------------- cos(x)
7 / 2 2 \ 9*cos (x)*\- cos (x) + 8*sin (x)/
6 / 2 2 \ 9*cos (x)*\- 56*sin (x) + 25*cos (x)/*sin(x)