Question : The given expression is equal to: $\frac{\left(1+\tan^2 A\right)}{\operatorname{cosec}^2 A \cdot \tan A}$
Option 1: $\sec^2A$
Option 2: $\sec A$
Option 3: $\tan A$
Option 4: $\tan^2A$
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Correct Answer: $\tan A$
Solution : Given: $\frac{\left(1+\tan ^2 A\right)}{\operatorname{cosec}^2 A \cdot \tan A}$ $=\frac{\left(\sec^2 A\right)}{\operatorname{\frac{1}{\sin^2A}} \cdot \frac{\sin A}{\cos A}}$ $=\frac{\left(\frac{1}{\cos^2 A}\right)}{\operatorname{\frac{1}{\sin A \cdot \cos A }}}$ $=\frac{\sin A \cdot \cos A }{\cos^2 A}$ $=\frac{\sin A}{\cos A}$ $=\tan A$ Hence, the correct answer is $\tan A$.
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