Find the value : ^2 ~A+ ^2 ~A- ^2 ~A cosec^2 ~A - Vidyadip

Question

Find the value : $\tan ^2 \mathrm{~A}+\cot ^2 \mathrm{~A}-\sec ^2 \mathrm{~A} \operatorname{cosec}^2 \mathrm{~A}$

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