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Prove that 2"tan"^(-1)1/2+"tan"^(-1)1/7=...

Prove that `2"tan"^(-1)1/2+"tan"^(-1)1/7="tan"^(-1)31/17`

Text Solution

Verified by Experts

The correct Answer is:
`="tan"^(-1)(31/21)/(17/21)="tan^(-1)31/17=R.H.S`
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