Question

Need help with integration by parts

Answer 1

I don't understand what integration by parts mean

Answer 2

It is a simple formula :
\[ \int U . V = U \int V - \int (\frac{d}{dx} U \int V ) dx \]
In this case:
\[ e^{-x} = U\]
\[ \sin x = V\]

Answer 3

yeah just realised before lol

Answer 4

thanks anyway