Question

Help!
Find f ΄(θ) if f (θ) = sin(θ) cos(θ).

Answer 1

Use the product rule :
(h*g)'(teta)= h'(teta)*g(teta) + h(teta)*g'(teta)
with h(teta)=sin(teta) and g(teta)=cos(teta)

Answer 2

I don't understand that.

Answer 3

f'(x)g(x)+f(x)g'(x)?

Answer 4

Yes

Answer 5

(-sin(theta))(-sin(theta)+(cos(theta))(-cos(thata))

Answer 6

-sin^2(theta) -cos^2(theta)?

Answer 7

no sin^2(theta) -cos^2(theta)

Answer 8

right? did I do that right?

Answer 9

your signs are not correct.