Exact value of \( \frac{\cos 21^{\circ}-\sin 21^{\circ}}{\sin ^{2} 57-\sin ^{2} 33^{\circ}} \) i....
Exact value of \( \frac{\cos 21^{\circ}-\sin 21^{\circ}}{\sin ^{2} 57-\sin ^{2} 33^{\circ}} \) is equal to
\( \mathrm{P} \)
(1) 2
(2) \( -\sqrt{2} \)
(3) 1
(4) \( \sqrt{2} \)
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