1.cot^2x+sec^2x=tan^2x+csc^2x 2.cos3x=4cos^3x-3cosx Can someone help guide me towards the answer but not actually give me the full solution to the answer. Thanks
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1. use the Pythagorean identities and in that order on the left side. They might need a slight rearrangement before you use them. 2. use the sum identity plus the fact that . you'll also need the double angle identity for cosine
K I'm not really sure how to show what I mean without solving it. This a long way but I thought I show you a different way to work the problem. Another way to see if the RHS is equal to the LHS is
Last edited by 11rdc11; Sep 28th 2008 at 01:54 PM.
Hello, johntuan!
Another way to do it using skeeter method which simplfies to
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