Cot70^°+4cos70^°=?

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cot 70^{\circ} + 4 cos 70^{\circ}

cot 70^{0} + 4 cos 70^{0}

\frac{3 \cos 55 °}{7 \sin 35 °} - \frac{4 (\cos 70 ° \cos e c 20 °)}{7 (\tan 5 ° \tan 25 ° \tan 45 ° \tan 65 ° \tan 85 °)}

\frac{3 cos 55^{\circ}}{7 sin 35^{\circ}} - \frac{4 (cos 70^{\circ} csc 20^{\circ})}{7 (tan 5^{\circ} tan 25^{\circ} tan 45^{\circ} tan 65^{\circ} tan 85^{\circ})}

\frac{3 cos 55^{\circ}}{7 sin 35^{\circ}} - \frac{4 cos 70^{\circ} . cos e c 20^{\circ}}{7 tan 5^{\circ} . tan 25^{\circ} . tan 45^{\circ} . tan 65^{\circ} . tan 85^{\circ}} = \frac{- 1}{7}

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