The expression \( \frac{\tan A}{1-\cot A}+\frac{\cot A}{1-\tan A} \...
The expression \( \frac{\tan A}{1-\cot A}+\frac{\cot A}{1-\tan A} \) can be written
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as
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(1) \( \sin \mathrm{A} \cos \mathrm{A}+1 \)
(2) \( \sec \mathrm{A} \operatorname{cosec} \mathrm{A}+1 \)
(3) \( \tan \mathrm{A}+\cot \mathrm{A} \)
(4) \( \sec \mathrm{A}+\operatorname{cosec} \mathrm{A} \)
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