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Solve the differential equation (1+y2)tan-1 x dx + 2y(1+x2)dy = 0. 

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by Expert (7.9k points)

 We have 
(1+y2)tan-1 xdx + 2y(1+x2)dy = 0
⇒ (1+y2)tan-1 xdx + 2y(1+x2)dy  

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