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| 1. |
(i) $ \frac{\sin ^{2} 63^{\circ}+\sin ^{2} 27^{\circ}}{\cos ^{2} 17^{\circ}+\cos ^{2} 73^{\circ}} $(ii) $ \sin 25^{\circ} \cos 65^{\circ}+\cos 25^{\circ} \sin 65^{\circ} $ |
| Answer» | |