hey its tri compund angle formulae proof. Prove that 4sin(x+1/6Pi)sin(x-1/6pi) is identical to 3-4cos^2x just tried to solve it but really confused. thanks
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Haven't tried it myself but try using the identity EDIT - Having re-read the question I dont think it'll work.
Last edited by Deadstar; Oct 7th 2009 at 09:03 AM.
Originally Posted by Deadstar Haven't tried it myself but try using the identity EDIT - Having re-read the question I dont think it'll work. yep lol havent seen that idenity in my life
Originally Posted by elliegurl yep lol havent seen that idenity in my life have you seen these two idenities on subtracting (2) from (1), you get now LHS
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