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OpenStudy (anonymous):
prove that please help me!! class is at 5 today!! Prove that cos4x = cos^4x - 6cos^x sin^2x + sin^4x?
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OpenStudy (anonymous):
wdum ?
OpenStudy (ribhu):
cos 4x = cos (2x+2x)
OpenStudy (anonymous):
cos4A = cos to the fourth power A - 6 cos squared A times sin squared A + sin to the 4 power A the original problem is cos4A=cos^4-6cos^2Asine^2A+sin^4A
OpenStudy (ribhu):
|dw:1426184899411:dw| @meaghan
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