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Prove that: `tan^(-1)(2/11)+tan^(-1)(7/24)=tan^(-1)(1/2)` |
Answer» We know, `tan^-1x+tan-^-1y = tan^-1((x+y)/(1-xy))` So,`L.H.S. = tan^-1(2/11)+tan^-1(7/24)` `=tan^-1((2/11+7/24)/(1-2/11**7/24))` `=tan^-1(125/250)` `=tan^-1(1/2)=R.H.S.` |
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