Hi,

Can someone help me with the interval 0 to pie/2 cos to the 5thxdx, please?

This is what I did:

cos2x=1/2(1+cos2x)

int. 0 to pie/2 (cos3x)cos2xdx=

1/2 int. (1+cos2x)cos3dx=

Then would I do a u substitution?

u=cos2x

du=-sin2x(2)dx

Thank you