1.

Prove that tan^(-1)(2/11) + tan^(-1)(7/24) = tan^(-1)(1/2)

Answer»

Solution :
L.H.S =`TAN(-1)((2/11 +7/11)/(1-2/11xx7/24)) = tan^(-1)(((48 + 77)/264)/((264-14)/264))`
`tan^(-1)(125/250) = tan^(-1)(1/2)` = R.H.S


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