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Evaluate : 4 (2 tan ^(-1)""(1)/(3)+tan ^...

Evaluate : `4 (2 tan ^(-1)""(1)/(3)+tan ^(-1)""(1)/(7))`

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tan ^(-1) ""(1)/(2) + tan ^(-1) ""(1)/(3)=

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Show that , 4 (2 tan ^(-1) ""(1)/(3)+tan ^(-1)""(1)/(7)) =pi

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Statement -I : tan ^(-1)""((3)/(4))+tan ^(-1) ""((1)/(7))= (pi)/(4) statement -II: "for" x gt 0 , y gt 0 tan^(-1 ) ((x)/(y))+tan^(-1)""((y-x)/(y+x))=(pi)/(4)

tan^(-1) (1/2)+ tan^(-1) (1/3) -

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prove that tan ^(-1)"" (1)/(4) + tan ^(-1) ""(2)/(9) + tan ^(-1) "" (1)/(5) + tan ^(-1) ""(1)/(8) =(pi)/(4).