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Prove that: cotA+"cot"(60^0+A)-cot(60^0-...

Prove that: `cotA+"cot"(60^0+A)-cot(60^0-A)=3cot3A`

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"Prove that " cotA + cot ( 60^(@) + A) + cot (120^(@) + A) = 3 cot 3 A.