1.

The value of sum_(j=1)^(20)sum_(i=1)^(20)tan^(-1)((i)/(j)) is :

Answer»

`200 PI`
`50 pi`
`150 pi`
`100 pi`

Solution :`sum_(j=1)^(20)sum_(i=1)^(20)TAN^(-1)((i)/(j)) = 100 pi`
`tan^(-1)((i)/(j))+tan^(-1)((j)/(i)) =(pi)/2`.


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