En los problemas 31 a 40 , resuelva el problema con va- lor inicial.
(x^(3)-y)dx+xdy=0,y(1)=3
.
(dy)/(dx)=((x)/(y)+(y)/(x)),y(1)=-4
.
(t+x+3)dt+dx=0,x(0)=1
.
(dy)/(dx)-(2y)/(x)=x^(2)cosx,y(\pi )=2
.
(2y^(2)+4x^(2))dx-xydy=0,y(1)=-2
.
[2cos(2x+y)-x^(2)]dx
+[cos(2x+y)+e^(y)]dy=0,y(1)=0
.
(2x-y)dx+(x+y-3)dy=0,y(0)=2
.
\sqrt(y)dx+(x^(2)+4)dy=0,y(0)=4
.
(dy)/(dx)-(2y)/(x)=x^(1)y^('),y(1)=3
.
(dy)/(dx)-4y=2xy^(2),y(0)=-4
.