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OpenStudy (anonymous):
cos^4 -sin^4 -> 1 -2sin^2
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OpenStudy (anonymous):
What have you tried so far?
OpenStudy (anonymous):
OpenStudy (anonymous):
I tried (cos^2 -sin^2)(cos^2-sin^2)
OpenStudy (anonymous):
a2-b2 = (a+b) (a-b) used during the first stage
OpenStudy (anonymous):
oh yes!
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OpenStudy (anonymous):
once use + and then -
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