Prove that , for all values of a , sin a (cos 2a+cos 4a+cos 6a)=cos 4a sin 3a i can prove this .. Deduce that i am not sure with this . i don see how i can use the prove above to solve this . Thanks for your help .
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Originally Posted by thereddevils Prove that , for all values of a , sin a (cos 2a+cos 4a+cos 6a)=cos 4a sin 3a i can prove this .. Deduce that i am not sure with this . i don see how i can use the prove above to solve this . Thanks for your help . So
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