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OpenStudy (anonymous):
Prove the following identity: cos3x= cos^3x - 3sin^2xcos step by step please I've gotten to: 2cos^3 x - cos x - 2sin^2 x cos x
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OpenStudy (anonymous):
can you wait one min for a photo or am I wasting my time?
OpenStudy (anonymous):
I can wait :)
OpenStudy (anonymous):
on its way... just a min..
OpenStudy (anonymous):
It was all about the double angle formula... thanks for the practice! :)
OpenStudy (anonymous):
how did I miss that! thank you!
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