Which of the following reduces to unity for \( 0^{\circ}\mathrm{A} ...
Which of the following reduces to unity for \( 0^{\circ}\mathrm{A} \)
\( \mathrm{P} \)
\( 90^{\circ} \) ?
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(1) \( \sin A \operatorname{cosec} A \sqrt{\operatorname{cosec}^{2} A-1} \)
(2) \( \left(1+\tan ^{2} A\right)\left(1-\sin ^{2} A\right) \)
(3) \( \sec ^{2} A-\sin ^{2} A \sec ^{2} A \)
(4) \( \frac{1}{1+\sin ^{2} A}+\frac{1}{1+\operatorname{cosec}^{2} A} \)
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