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[" samyor "16." Flas tislr "66-],[" tan ...

[" samyor "16." Flas tislr "66-],[" tan "^(-1)(1)/(x+y)+tan^(-1)(y)/(x^(2)+xy+1)=cot^(-1)x]

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tan^(- 1) (1/(x+y)) +tan^(- 1) (y/(x^2+x y+1)) =cot^(- 1)x

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