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OpenStudy (anonymous):
The expression cos^2X - cos2X is equivalent to what?
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OpenStudy (experimentx):
(sin x)^2
OpenStudy (anonymous):
can you explain how you got that ? i need to show my work
OpenStudy (experimentx):
cos 2x = (cos x)^2 - (sin x)^2 => just expand cos(a+b) where a and b are both x
OpenStudy (experimentx):
rest you know what to do
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