" 4."quad {(xy)cos(xy)+sin(xy)]dx+x^(2)cos(xy)dy=0

Solve: {(xy)cos(xy)+sin(xy)}dx+x^2cos(xy)dy=0

Solve: {(xy)cos(xy)+sin(xy)}dx+x^2cos(xy)dy=0

x(ydx+xdy)cos(xy)+sin(xy)dx=0

x(ydx+xdy)cos(xy)+sin(xy)dx=0

(3xy+y^(2))dx+(x^(2)+xy)dy=0

If cos (xy) =sin (x+y) ,then (dy)/(dx)

cos (x + y), sin (x + y), - cos (x + y) sin (xy), cos (xy), sin (xy) sin2x, 0, sin2y] | = sin2 (x + y)

If 3sin(xy)+4cos(xy)=5, then (dy)/(dx)=(y)/(x) (b) (3sin(xy)+4cos(xy))/(3cos(xy)-4sin(xy))(c)(3cos(xy)+4sin(xy))/(4cos(xy)-3sin(xy))(d) none

Solve (y+sinxcos^(2)(xy))/(cos^(2)(xy))dx+((x)/(cos^(2)(xy))+siny)dy=0.

Solve (y+sinxcos^2(xy))/(cos^2(xy))dx+(x/(cos^2(xy))+siny)dy=0