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OpenStudy (anonymous):
Rewrite cos^4x in terms of the first power of the cosine Explain
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hartnn (hartnn):
do you know the double angle formula for cos ? cos 2x = .... ? in terms of cos^2 x
OpenStudy (anonymous):
Cos2x = cos^2x-sin^2x , 2cos^2x-1 , or 1-2sin^2x
hartnn (hartnn):
use cos 2x = 2cos^2x -1 can you find (isolate) cos^2 x from that ?
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