You are not logged in.

- Topics: Active | Unanswered

http://www.mathsisfun.com/algebra/trig- … angle.html

Wonderful page, indeed!

BTW, Please include this formula too:

*Last edited by Agnishom (2014-02-03 14:07:53)*

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'But our love is like the wind. I can't see it but I can feel it.' -A Walk to remember

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

Isn't sin(A)/2 easier than sin(A/2)cos(A/2) ?

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

It is but then high school children do not always know the T-ratios of obtuse angles.

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'But our love is like the wind. I can't see it but I can feel it.' -A Walk to remember

Offline