find α,β,γ,δ
,β<>0
f(x)=γ,χ=1
f(x)=(αx^3-1)/(x-1),x<1
f(x)=(sqrt(x^2+8))/(β(x^3-1)),x>1
there is a limit at x=1 and lim f(x),x->1=f(1)
