cos(x2+2y)+xey=0
dxd[cos(x2+2y)+xey]=dxd[0]
dxd[cos(x2+2y)+xey]=dxd[0]
(−sin(x2+2y)).dxd[x2+2y]+dxd[ey].x+ey.dxd[x]=0
−(dxd[x2]+dxd[2y])sin(x2+2y)+ey.dxd[y].x+ey.1=0
−(2x+2y′)sin(x2+2y)+eyy′x+ey=0
−(2y′+2x)sin(2y+x2)+xeyy′+ey=0
y′=2sin(2y+x2)−xey2xsin(2y+x2)−ey
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