- #1

- 105

- 1

[tex]\int\cos^{5}7x\sin7xdx[/tex]

I attempted to set [tex]u=\cos^{5}7x[/tex] and ended up with (by chain rule...which I hope is correct!):

[tex]du=-35\cos^{4}7x\sin7xdx[/tex]

This doesn't seem too helpful but can't think of a better substitution.

Any advice is appreciated

Andrew