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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)*

'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

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,569

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

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

'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

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