Calcule a integra de (-senx)e^cosx
I take this to mean calculate \(\int(-\sin x)e^{\cos x}dx\)
Well, since the derivative of cos x is - sin x, and that of ex is just ex, we can see from the chain rule that:
\(\int(-\sin x)e^{\cos x}dx = e^{\cos x}\) plus a constant of course.
