(x^2+1)dx+x^2y^2dy=0

need help:)..thanks.

(x^2+1)dx + x^2y^2dy=0

x^2y^2 dy = -(x^2+1) dx
y^2 dy = -(x^2+1)/x^2 dx
1/3 y^3 = -x + 1/x + C
...