20*sin(x)*cos(x) ---------------- 3
d /20*sin(x)*cos(x)\ --|----------------| dx\ 3 /
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the product rule:
; to find :
The derivative of cosine is negative sine:
; to find :
The derivative of sine is cosine:
The result is:
So, the result is:
Now simplify:
The answer is:
2 2 20*sin (x) 20*cos (x) - ---------- + ---------- 3 3
-80*cos(x)*sin(x) ----------------- 3
/ 2 2 \ 80*\sin (x) - cos (x)/ ---------------------- 3