
!if $[randint(2)]=0
 ra=$[-3*($rp)^2+($AA)]
 rb=$[2*($rp)^3+($BB)]
 f=x^3 + a*x + b
 y=t^3 + a*t + b
 dery=3*t^2 + a
!else
 ra=$[3*($rp)^2+($AA)]
 rb=$[-2*($rp)^3+($BB)]
 f=-x^3 + a*x + b
 y=-t^3 + a*t + b
 dery=-3*t^2 + a
!endif
x=t
derx=1

var=x

