Need help with this calc question don't know how to tackle it.

What is the derivative of the function f(x) = (sinx)(et) - (cosx)(ex)? Select one: O a. cos xet + sin xe* - sin xe* + 2 cos xelk O b. cos xe* + sinxe* + sin xex - 2 cos xezx O c. cos xe + sin xe2x O d. sin xex - 2 cos xe2x