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" The value of "tan^(-1)(4)/(7)+tan^(-1)...

" The value of "tan^(-1)(4)/(7)+tan^(-1)(4)/(19)+tan^(-1)(4)/(39)+tan^(-1)(4)/(67)+........oo" equals "

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tan^(-1)((4)/(7))-tan^(-1)((1)/(5))=tan^(-1)((1)/(3))

tan^(-1)((4)/(7))+tan^(-1)((1)/(7)) = tan^(-1)((7)/(9))

2tan^(-1)((1)/(5))+tan^(-1)((1)/(8))= tan^(-1)((4)/(7))

tan^(-1)((3)/(4))+tan^(-1)((3)/(5))-tan^(-1)((8)/(19))=

The value of tan^(-1)""4/7+tan^(-1)""4/19+tan^(-1)""4/39+tan^(-1)""4/67… infty equals

"tan"^(-1)((1)/(3))+ "tan"^(-1)((2)/(9)) + tan^(-1)((4)/(3^(3))) + ....oo is equal to

The value of tan^(-1)(tan((3pi)/4))=

tan^(-1)(1/7)+tan^(-1)(4/7)+tan^(-1)(9/7)=.........