class 12

Math

Calculus

Differential Equations

If a curve $y=f(x)$ passes through the point $(1,−1)$ and satisfies the differential equation $,y(1+xy)dx=xdy$ , then $f(−21 )$ is equal to:(A) $−52 $ (B) $−54 $ (C) $52 $ (D) $54 $

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