I'm sure that I'm missing an identity here, but how do I get from: -4cos(t)cos(2t)-2sin(t)sin(2t) to -4cos^{3}(t) Thanks for any help.
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Originally Posted by MajMinor I'm sure that I'm missing an identity here, but how do I get from: -4cos(t)cos(2t)-2sin(t)sin(2t) to -4cos^{3}(t) Thanks for any help. Use the product to sum identities to get by the triple angle forumla you get the desired result
Thanks for the help.
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