सिद्ध कीजिए कि \[ \frac{1-\sin A}{1-\sec A}-\frac{1+\sin A}{1+\sec A}=2 \cot A(\cos A-\operatorn...

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सिद्ध कीजिए कि
\[
\frac{1-\sin A}{1-\sec A}-\frac{1+\sin A}{1+\sec A}=2 \cot A(\cos A-\operatorname{cosec} A)
\]
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