Question

How do you find the derivative of `cos(2x+3)`?

Answer 1

`-2sin(2x+3)`

Explanation:

The way to do this is by using the chain rule.
The derivative of `cos(x)` is `-sin(x)`:
`d/dxcos(2x+3)=-sin(2x+3)*d/dx(2x+3)`

The derivative of `2x+3` is `2`, so the full derivative becomes:
`d/dxcos(2x+3)=-2*sin(2x+3)`