# Math Help - Integration by substitution

1. ## Integration by substitution

Find u and du

The indefinite integral sec2xtan2xdx

I need help telling the derivative from the function apart.

Find u and du

The indefinite integral sec2xtan2xdx

I need help telling the derivative from the function apart.
Try $u = \sec{2x}$

3. Would this work?

sec2xtan2xdx = sin2x dx/(cos2x)^2

let u = cos2x---> du = -2sin2xdx