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Trigonometry identities watch

1. by first writing sin 3 theta = sin (2 theta + theta)
show that sin 3 theta = 3sin theta - 4sin^3 theta

ps: how to type those mathematical symbols (e.g. ^2 , theta) on my mac..?
many thanks!!!
2. (Original post by jianwen)
by first writing sin 3 theta = sin (2 theta + theta)
show that sin 3 theta = 3sin theta - 4sin^3 theta

ps: how to type those mathematical symbols (e.g. ^2 , theta) on my mac..?
many thanks!!!
Double angle formulae.

http://www.thestudentroom.co.uk/wiki/LaTeX
3. thank you for the link !!
(Original post by morgan8002)
Double angle formulae.

http://www.thestudentroom.co.uk/wiki/LaTeX

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