Thread: Integrating a trigonometric function!?

Trying to integrate fx = (xsin3x) with the limits upper limit=pi/3 and lower limit 0.

I tried integration by parts but doesnt seem to work out.

u=x so du= 1
dv=sin3x so v=-cos3x

then i tried (uv- /int vdu)

now im still stuck... answers or help would be much appreciated

Originally Posted by Yehia

Trying to integrate fx = (xsin3x) with the limits upper limit=pi/3 and lower limit 0.

I tried integration by parts but doesnt seem to work out.

u=x so du= 1
dv=sin3x so v=-cos3x

then i tried (uv- /int vdu)

now im still stuck... answers or help would be much appreciated

That's exactly what you do... except if then .


So



.


Now insert your terminals.