- Thread starter
- #1

#### karush

##### Well-known member

- Jan 31, 2012

- 3,241

my first step with this was

$\displaystyle4\int_0^\frac{1}{2}\frac{1}{1+4t^2}dt$

thot this could be a log rule. but doesn't seem to fit into that

the answer to this is $\frac{\pi}{2}$