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| 1. |
Without using trigonometric tables, evaluate:\frac{3 \tan 25^{\circ} \tan 40^{\circ} \tan 50^{\circ} \tan 65^{\circ}-\frac{1}{2} \tan ^{2} 60^{\circ}}{4\left(\cos ^{2} 29^{\circ}+\cos ^{2} 61^{\circ}\right)} |
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