Question

Identify u and du for the integral.

1. The integral of [(cosx)/(sin^(2)x)]dx

2. The integral of sec2xtan2xdx

Answer 1

I suppose you are referring to substitution.

1.
I=&ing;cosxdx/sin²x
put u=sin(x)
du = cos(x)dx
So
I=∫du/u

Do the same for 2.