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OpenStudy (anonymous):
identify the identity sec^2 [(pi/2) - x]- 1= cot^2 x please help!
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OpenStudy (anonymous):
there it is...
OpenStudy (anonymous):
write that left side as \[\large \frac {1}{\cos^2( \frac {\pi}{2}-x)}-1\]
OpenStudy (anonymous):
then try using the sum/difference formulas for sin/cos...
OpenStudy (anonymous):
thanks!
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