restart;
with(plots):
read("khtools.m");
P:=y->0.8728350920e-2*y^7-.2626950683*y^6+47.66577899*y+3.147340034*y^5-89.75801494*y^2-18.98393186*y^4+59.68279449*y^3+1:
P1:=D(P):
P2:=D(P1):
delta:=x->max(0.05,min(0.6,1/(abs(P1(x))+0.3*abs(P2(x)))));
khbox(P,0,8,delta);
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