9.1 	a) Plot[{x^3-3x^2}, {x, -2, 4}]
	d) Plot x/ln x


9.2	a) plot x^3-6x^2+12x+4
	b) plot 3/(x-4)
	d) plot x^2(lnx-0.5)
	e) plot e^(-x^2)

9.3	a) plot -arctan x -1
	b) plot 1/e-e^(-x)
	c) plot 1-arctan x

9.4	b) plot[{8x^2-x^4, 16},{x,-4,4}]
	e) plot[{x*(ln x)^2, 4/e^2},{x,-1,2}]
	g) plot[{sqrt(2x^3+3x^2), 1},{x,-2,2}]
	h) plot x-arctan x
	j) plot[{ln(x^4+4x^3+30), ln 3},{x,-5,5}]
	k) Plot[Piecewise[{{ln -x, x < 0}, {ln x, x > 0}}], {x, -2, 2}]

9.5	a&b) plot[{x^2-2x+3, 2, 18},{x,0,5}]
	c) plot[{x^3-3x+1, -1, 19},{x,-2,3}]
	d) plot[{x-ln x, 1, e-1},{x,1/e,e}]
	e) plot[{(sin x)^2,1},{x,-pi,pi}]
	h) plot[{x/(1+x^2),1/2,-1/2},{x,-2,2}]
	roots x/(1+x^2)
	solve x/(1+x^2)> 0
	solve x/(1+x^2)< 0
	monotonicity x/(1+x^2)
	points of inflection x/(1+x^2)
	extrema x/(1+x^2)
	asymptotes x/(1+x^2)

9.7	plot[{4x(6-x)(4-x),640/27+sqrt(7)*448/27},{x,-1,10}]

9.8	plot 3p^2-35/4p^3, 64/1225

9.9 	plot 1*x^2*(1-x), 4/27

9.12	b) asymptotes x^2/(x^2-4)
	f) asymptotes 2x-(cos x) / x

9.13	b) asymptotes (4x+4)/x^2
	f) asymptotes sqrt|x^2-2x|
	

Kruus	plot[{pi*x^2+2/x,3*(pi)^(1/3)},{x,-2,2}]