I need to find the equation of the tangent line to $f′(x) = 4 \sin x + 3 \cos x$ at $x= π/3$. I'm trying to incorporate the slope point formula.
Progress
This is what I got: $f'(x)= 4 \cos x- 3 \sin x$ at $x= π/3$, $$f(π/3)= 4 \cos π/3 - 3 \sin π/3 = 4(1/2)-3(\sqrt{3}/2) = ?? $$