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सिद्ध कीजिए कि "tan"^(-1)5-"tan"^(-1)3...

सिद्ध कीजिए कि
`"tan"^(-1)5-"tan"^(-1)3+"tan"^(-1)7/9=(pi)/4`

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tan^(-1)7-tan^(-1)5=tan^(-1)(1/18)

tan^(-1)7-tan^(-1)5=tan^(-1)(1)/(18)

Prove that tan^(-1)3/4+tan^(-1)3/5-tan^(-1)8/19=pi/4 .

PT tan^(-1)(3/4)+tan^(-1)(1/3)=tan^(-1)(13/9)

tan^(-1)[ tan(-(3 pi)/(4))]

tan^(-1) . 3/5 +tan^(-1) . 1/4 = pi/2

tan^(-1)("tan"(7pi)/(5))

prove tan^(-1)(3/5)+tan^(-1)(1/4)=(pi)/(4)