Question

dx- (1 + xy ) dx. dy​

Answer 1

Answer:

$dx - dxdy + {d}^{2} {x}^{2} {y }^{2} \\ \\ dx - {d}^{2} xy + {d}^{2} {x}^{2} {y }^{2} \\ \\ \\ dx(1 - dy + dxy)$