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OpenStudy (anonymous):
Trigonometric expression help (look in comments)
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OpenStudy (anonymous):
\[\frac{ \tan 15 ° }{ 1 - \tan^215 ° }\] I know there's a formula but the answer in the back of my textbook gives me the solution: |dw:1443639097573:dw| How do you get the 1/2 and then the nominator is 2tan 15 °?
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