16.Cot 70+4cos 70 = ?

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

Which method of purification is represented by the following equations?

$N i + 4 C O$ $70^{\circ} C - -- \to$ $N i (C O)_{4}$ $180^{\circ} C - --- \to$ $N i + 4 C O$

(1 + sec 20^{o} + cot 70^{o}) (1 - c o s e c 20^{o} + tan 70^{o}) = 2

cot 15^{\circ} cot 20^{\circ} cot 70^{\circ} cot 75^{\circ}

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