I'm having trouble making sense of addition and subtraction in trig identities. cos^6x + sin^6x = 1 - 3 sin^2x + 3 sin^4x
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Originally Posted by casey_k I'm having trouble making sense of addition and subtraction in trig identities. cos^6x + sin^6x = 1 - 3 sin^2x + 3 sin^4x Notice that . So we can rewrite the original function as . What does this equal?
Last edited by Prove It; April 23rd 2009 at 09:40 PM.
Originally Posted by casey_k I'm having trouble making sense of addition and subtraction in trig identities. cos^6x + sin^6x = 1 - 3 sin^2x + 3 sin^4x two hints ...
I didn't get it at first because I expanded the right side both (cos^2x)^3 + (sin^2x)^3 but then I realized I only had to expand cos. Thank you!
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