Question

Find derivative of cos 2x using chain rule? Please help, studying for midterm?

Answer 1

do u understand d chain rule?

Answer 2

I understand the chain rule. Would you get (-sin x) (2x) (2)?

Answer 3

yep

Answer 4

wait its -sin2x

Answer 5

Okay the problem I'm having is with simplification.. what do I do from here?>

Answer 6

just put d 2 in front of sin2x

Answer 7

I thought chain rule was f' x g x g'

Answer 8

so its -2sin2x

Answer 9

(-sin x) (2x) (2) simplifies to -2sin2x?

Answer 10

\[\frac{d}{dx} \left( \cos(2x) \right) = -\sin(2x) \times \frac{d}{dx} \left(2x \right)\]

Answer 11

yes.

Answer 12

yep

Answer 13

(-sin x) (2x).. why wouldn't this be sin (2x^2)?

Answer 14

cause (-sin2x)(2) u cannot separate the 2x from sin they are married for life