If somebody can help me how to solve couple of equations:
tandr + 2rDo=0
(x+4)(y^2+1)dx +y(x^2+3x+2)dy=0
(2xy+3y^2)dx-(2xy+x^2)dy=0
is first oder equations
this is incomprehensible
this is of variables seperable type:(x+4)(y^2+1)dx +y(x^2+3x+2)dy=0
$\displaystyle \frac{dy}{dx}=-\frac{(x+4)(y^2+1)}{y(x^2+3x+2)}=-\frac{x+4}{x^2+3x+2}\ \frac{y^2+1}{y} $
$\displaystyle \frac{y}{y^2+1}\frac{dy}{dx}=-\frac{x+4}{x^2+3x+2} $
RonL