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OpenStudy (anonymous):
what is plane trig proof for (1/1+cosx) + (1/1-cosx) = 2csc^2x
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OpenStudy (anonymous):
"plane" or "plain"?
OpenStudy (anonymous):
thats not important
OpenStudy (anonymous):
Well, I have never heard of a plane proof, if that is a proper proof. Otherwise, this is a very simple identity to show.
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