Prove that `(i).(sin 2x)/(1-cos 2x) = cot x' ' (ii) .(1- cos 2x)/(1+ cos 2x) = tan^(2) x`

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Prove that `(i).(sin 2x)/(1-cos 2x) = cot x" " (ii) .(1- cos 2x)/(1+ cos 2x) = tan^(2) x`
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