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OpenStudy (anonymous):
Why is cos^2 x(1+tan^2 x) = 1 not a trig identity?
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OpenStudy (anonymous):
@AravindG please
OpenStudy (aravindg):
Who said it isn't?
OpenStudy (aravindg):
As far as I can see it holds for all cases except x=90 degree. Perhaps thats why they don't call it an identity.
OpenStudy (anonymous):
well I didn't think it is; is it? i basically need to explain why it is or isn't
OpenStudy (anonymous):
@mathmale
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