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| 1. |
\begin{array}{r}{\frac{\tan ^{2} \theta}{\tan ^{2} \theta-1}+\frac{\csc ^{2} \theta}{\sec ^{2} \theta-\csc ^{2} \theta}} \\ {=\frac{1}{\sin ^{2} \theta-\cos ^{2} \theta}}\end{array} |
| Answer» | |