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OpenStudy (anonymous):
sin^2x-cos^2x=1 for all values of x true or false
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OpenStudy (anonymous):
Well, I know that sin^2x PLUS cos^2x = 1 so...
OpenStudy (anonymous):
so false
OpenStudy (anonymous):
Yea
OpenStudy (anonymous):
Medal please?
OpenStudy (anonymous):
A simple proof would be to add cos^2 to each side, then you would have 1-cos^2 = 1+cos^2. Subtract 1 from each side and --> -cos^2 = cos^2 which is absurd.
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