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OpenStudy (ohohaye):
Please Please Help Me!!!
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OpenStudy (ohohaye):
OpenStudy (amorfide):
it helps to know where the formula was derived from \[\cos(A+A)=cosAcosA-sinAsinA\] for whatever value A is \[\cos2A=\cos^{2}A-\sin^{2}A\]
OpenStudy (ohohaye):
Is it true?
OpenStudy (amorfide):
yes
OpenStudy (ohohaye):
Ok, thank you
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