सिद्ध कीजिएः (i) "tan"^(-1)a/b-"tan"^(...

सिद्ध कीजिएः
(i) `"tan"^(-1)a/b-"tan"^(-1)(a-b)/(a+b)=(pi)/4`
(ii) `"tan"^(-1)1+"tan"^(-1)2+"tan"^(-1)3=pi`
(iii) `2"tan"^(-1)1/3+"tan"^(-1)1/7=(pi)/4`
(iv) `"tan"^(-1) (1/2)+"tan"^(-1)(1/3)=(pi)/4`
(v) `"tan"^(-1)2/11+"tan"^(-1)7/24="tan"^(-1)1/2`
(vi) `2"tan"^(-1)1/2+"tan"^(-1)1/7="tan"^(-1)31/17`

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