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Prove that angle between the tangetns th...

Prove that angle between the tangetns that can be drawn from any point ` (x_(1) , y_(1))` to the ellipse is ` tan ^(-1)"" (2 ab sqrt((x_(1)^(2))/(a^(2))+(y_(1)^(2))/(b^(2))-1))/(a_(1)^(2) + y_(1)^(2) - a^(2) - b^(2))`

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