# Forgot how to integrate

1. Jan 21, 2009

### jaredmt

1. The problem statement, all variables and given/known data
how do i integrate sec^2(x)
i completely forgot how to do this one. i know i could rewrite it as:
tan^2(x) + 1 and integrate that, but i forgot how to integrate that 1 too

2. Relevant equations

3. The attempt at a solution

2. Jan 21, 2009

### quasar987

tan^2(x) + 1 is "obviously" the derivative of tan(x).

3. Jan 21, 2009

### rock.freak667

All you need to remember is that

$$\frac{d}{dx}(tanx)= sec^2x$$

and you should be well off now.