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OpenStudy (anonymous):
HELP I GIVE MEDALS!!! (1 - cos x)(1 + cos x)
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OpenStudy (anonymous):
foil the equation.
OpenStudy (anonymous):
(1+cos x) (1- cos x) = (1-cos^2 x)
OpenStudy (anonymous):
sin ^(2) x ;)
OpenStudy (anonymous):
plus, 1-cos^2x just so happens to equal sin^2 x
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