Question

Evaluate the integral:
23e^xcos2xdx

Answer 1

\[23\int\limits_{?}^{?}e ^{xcos2x}dx\]
then you do the derivative of xcos2x
\[f \prime(x) = x(-2\sin2x)+\cos2x\]
then put it all into one:
\[23e ^{xcost2x}/(-2xsin2x+\cos2x) \]
insert limits if you like...