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The expression (t a n A)/(1-cot A)+(cot ...

The expression `(t a n A)/(1-cot A)+(cot A)/(1-t a n A)` can be written as `sin A cos A+1` b. `s e c A\ cos e c A+1` c. `t a n A+cot A` d. `s e c A+cos e c A`

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