Question

z=arctgx+y/x-y полный дифференциал

Answer 1

dz = (-y/(x² + y²))dx + (x/(x² + y²))dy.

Answer 2

Cucci Gang

Answer 3

dz = (1/x)*1/(1+y^2/x^2)dy - (y/x^2)*1/(1+y^2/x^2)dx