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OpenStudy (anonymous):
exand cos (4theta)
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OpenStudy (anonymous):
double angle formula?
OpenStudy (anonymous):
cos(4theta) = cos(2(2theta)) = cos^2(2theta)-sin^2(2theta)
OpenStudy (anonymous):
Then you have even more double angles.
OpenStudy (anonymous):
thanks!
OpenStudy (anonymous):
do you know if Im able to expand cos^2(2* theta)?
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