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OpenStudy (anonymous):
cos2a=1- 2sin^2a for all values of a true or false
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OpenStudy (anonymous):
I think it's true am i right if not why?
OpenStudy (anonymous):
2*a? or cos^2a
OpenStudy (anonymous):
If 2*a, true.
OpenStudy (anonymous):
cos^2a so its false thanks
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