Dadidadida: Half Angle Trig Identities

Wednesday, March 20, 2013

Half Angle Trig Identities

$\begin{aligned} \sin \frac{u}{2} &= \pm \sqrt{ \frac{1 - \cos u}{2} } \\ \cos \frac{u}{2} &= \pm \sqrt{ \frac{1 + \cos u}{2} } \\ \tan \frac{u}{2} &= \pm \sqrt{ \frac{1 - \cos u}{1 + \cos u} } = \frac{\sin u}{1 + \cos u} = \frac{1 - \cos u}{\sin u} \\ \end{aligned}$

Useful and not hard to verify.

# posted by rot13(Unafba Pune) @ 10:01 PM

Comments: Post a Comment

<< Home

Wednesday, March 20, 2013

Half Angle Trig Identities

Dadidadida ...

Links

Previous Posts

Archives