- #1
emlekarc
- 27
- 0
Homework Statement
Integrate dx/((x^2+1)^2)
Homework Equations
Tan^2=sec^2-1
The Attempt at a Solution
So I let x=tanx then dx=sec^2x
Then plugging everything in;
Sec^2(x)/(tan^2+1)^2
So it's sec^2/(sec^2x)^2) which is sec^2x/sec^4x
Canceling out the sec^2 gives you
1/sec^2x
Integrate: ln(sec^2x)+C
Is that right?