Question

d/dx sin(2x)?

Answer 1

2 cos(2x)

Answer 2

f'(x) = cos(2x) (2)
f'(x) = 2cos(2x)

Answer 3

derivative of sin is cos and don't forget the chain rule to get the 2 outside

Answer 4

think chain rule:

[f(g(x))]' = f'(g(x)) * g'(x)