dx/dt = -x
dy/dt = y


dx/dt=-y+a*x
dy/dt=x+a*y


dx/dt=a*x*x
dy/dt=b*y


dx/dt=a1*x+f1(x,y)
dy/dt=a2*y+f2(x,y)  a2<a1<0


dx/dt = -y-x*(x*x+y*y-1)
 dy/dt = x-y*(x*x+y*y-1)



dx/dt=y
dy/dt=-(g/l)*sin(x)-c*y/(l*m)


:
 dx/dt=y
 dy/dt=-a*y+0.5*x*(1-x*x)+f*cos(w*t) 

:
 dx1/dt=x2
 dx2/dt=-k*x2-x2*x2*x2+B*cos(t) 

"-"
 dx/dt=a1x-b1yx
dy/dt=-a2y+b2yx  

   
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