Question

Let g(theta)= (theta)cos(theta). Find g'(pi/3).

I'm confused about which derivative rule I should be using. Quotient? I may not be approaching the problem correctly at all.

Answer 1

I'll give it a try that way, thank you!

Answer 2

Product Rule work.

Answer 3

the product rule is:
\[(f.g)'(x)=f'(x)g(x)+f(x)g'(x)\]

Answer 4

product rule\[1\cos (\theta)-\theta*\sin(\theta) =1/2-\sqrt{3}/2\]