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## Homework Statement

f(x)=sin(2x+5)

## Homework Equations

I am supposed to find the derivative, and the domain of it. The problem is that I cannot deal with the simplification of it.

## The Attempt at a Solution

As far as I know, I am suppsosed to use f(x+h)-f(x)/h

= sin(2(x+h)+5)-(sin(2x+5))/h

I tried expanding what's inside, as in sin(2x+2h+5)-sin(2x+5)/h

But that doesn't seem to lead to a solution

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