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The expression (tanA)/(1-cotA)+(cotA)/(1...

The expression `(tanA)/(1-cotA)+(cotA)/(1-tanA)` can be written as (1) `s e c A""cos e c A""+""1` (2) `t a n A""+""cot A` (3) `s e c A""+""cos e c A` (4) `s in A""cos A""+""1`

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