[SOLVED] Differentiation involving Pi 1. The problem statement, all variables and given/known data Differentiate sin(t) + (pi)cos(t) 2. Relevant equations Am I supposed to leave pi alone and just solve for the cos and sin parts? Or do I get f'(x) of pi as well? 3. The attempt at a solution I know that f'(x) of sin(t) = cos(t) Now what do I do with the (pi)cos(t) part? Do I say that the slope of pi is zero, therefore the derivative of (pi)cos(t) is 0, then the answer would be just sin(t) for the whole equation. OR Leave pi there, and have f'(x) of cos(t)= -sin(t) so that would make: cos(t) + (pi)(-sin[t]) ?