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OpenStudy (anonymous):
-tan^2x+sec^2x=1
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OpenStudy (cwrw238):
use the identity sec^2 x = 1 + tan^2 x
OpenStudy (cwrw238):
i am assuming you need to prove an identity?
OpenStudy (cwrw238):
* the identity
OpenStudy (anonymous):
|dw:1418054464183:dw|
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