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OpenStudy (anonymous):
prove that cos4x=8cos4x−8cos2x+1
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OpenStudy (anonymous):
\(\cos 4x \) or \(\cos ^4x \) ?
OpenStudy (anonymous):
cos4x
OpenStudy (anonymous):
Then this is not true.
OpenStudy (anonymous):
cos4x=8cos^4x−8cos^2x+1
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