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Precalculus Mathematics Homework Help
Prove the double angle formula through the following method
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[QUOTE="tia89, post: 4488727, member: 464176"] First of all, don't use all the same letter, otherwise you will be confused about who is who in like a second... this is always good rule in math... Now assuming b=a/2, you have cos(2b)=cos^2(b)-sin^2(b) indeed... now you can use the fundamental formula cos^2(b)+sin^2(b)=1 and express cos(2b) only as function of the sin^2(b). Done this, all is straightforward replacing b with a/2 [/QUOTE]
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Precalculus Mathematics Homework Help
Prove the double angle formula through the following method
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