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
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
Last edited by a moderator: