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

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

Text Solution

Verified by Experts

The correct Answer is:
`3. (1/(3x - x^(3)))/(1 - 3x^(2)) 3. 1/(tan 3 A) = 3 cot 3 A = R.H.S.`
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