Prove that 2tan^−1 1/2+tan^−1 1/7=tan^−1 31/17

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asked Jan 13, 2018 in Mathematics by sforrest072 (157,439 points) 61 410 940
edited Mar 6, 2018 by faiz

Prove that 2tan−11/2+tan−11/7=tan−131/17

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answered Jan 13, 2018 by mdsamim (213,225 points) 5 10 15
selected Jan 13, 2018 by sforrest072
 
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To prove: 2tan-11/2+tan-11/7=tan-131/17
LHS =2tan-11/2+tan-11/7

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