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OpenStudy (anonymous):
(cos^2)x*(sec^2)x-1=(sin^2)x verify using trig identities
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OpenStudy (anonymous):
but cos^2 x . sec^2 x = 1 !? :P
OpenStudy (anonymous):
but cos^2 x . sec^2 x = 1 !? :P
OpenStudy (raden):
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