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OpenStudy (anonymous):
verify: sin^4(x) – cos^4(x) = 2sin^2(x) – 1
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OpenStudy (loser66):
any idea?
OpenStudy (anonymous):
quadratic factoring to start ?
OpenStudy (loser66):
we can say that, ok, what you get?
OpenStudy (loser66):
Hint: (sin^2)^2 -(cos^2)^2 = ......
OpenStudy (anonymous):
1
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OpenStudy (anonymous):
no wait thats plus cos^2x makes it sin^2x - 1+ sin^2x
OpenStudy (anonymous):
@Loser66
OpenStudy (loser66):
you got it,
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