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| 1. |
Find the value of:\frac{-\tan \theta \cdot \cot \left(90^{\circ}-\theta\right)+\sec \theta \cdot \csc \left(90^{\circ}-\theta\right)+\sin ^{2} 35^{\circ}+\sin ^{2} 55^{\circ}}{\tan 10^{\circ} \tan 20^{\circ} \tan 30^{\circ} \tan 70^{\circ} \tan 80^{\circ}} |
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