2009-11-12, 06:26 AM
This is a rather nasty thing.
First off, use the half-angle formula to prove this:
![[Image: yzdwuk2.png]](http://mathurl.com/yzdwuk2.png)
Then, we're off!
![[Image: ycr3ycs.png]](http://mathurl.com/ycr3ycs.png)
Looks almost like we hit a dead-end, but thankfully, the additive arctangent formula comes to use:
![[Image: yhgwmsw.png]](http://mathurl.com/yhgwmsw.png)
Now, we're basically done:
![[Image: yblxo4n.png]](http://mathurl.com/yblxo4n.png)
Noah
First off, use the half-angle formula to prove this:
Then, we're off!
Looks almost like we hit a dead-end, but thankfully, the additive arctangent formula comes to use:
Now, we're basically done:
Noah