hey guys i recently joined, after seeing how helpful this site is =]

i have a test tommorow and i cant figure out these review problems

hope you guys can help thanks in advance

integral cos(5x)cos(sin(5x)dx

u- Sin(5x)

teacher gave U.

Integral 2x^2 sin (3x) DX

teacher said this one is part to part.. and we use a table method?

i was absent for this part of the lesson.. its said to make the problem easier to do or something?

intergral Sin^2(x)DX

intergral e^x sin(x)Dx