Prove that

Really not sure about using the compound angle formula. Thanks for any help

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- Sep 9th 2009, 12:22 PMgreghuntertrigonometry compund angle formula
Prove that

Really not sure about using the compound angle formula. Thanks for any help - Sep 9th 2009, 01:00 PMred_dog

- Sep 10th 2009, 10:55 AMgreghunterFinding the values
Thanks, I managed to work out what to do in the end. Can anyone tell me what you would do to find ?

- Sep 10th 2009, 06:56 PMpacman
aaahh, you post this as a trigonometric equation? i thought it was an identity as as solved by red_dog, YOUR post is an identity . . . .