Question

Derivative of -sin x? Is it -cos x or cos x sin x (chain rule applied)?

Answer 1

-Cos(x)

Answer 2

-Sinx = -1*Sin(x)
(-Sinx)' = -1*(Sinx)' = -1*Cosx=-Cosx

Answer 3

Thanks!

Answer 4

Show/explain how you'd use the chain rule to get -sinx to become cosxsinx (this might help you understand why it's not reasonable)