17.1	c) integral 1/x^(1.001) dx from 1 to infty
	e) integral (x^3+1)/x^5 dx from 1 to infty
	f) integral (x^3+1)/x^4 dx from 1 to infty
	h) integral e^(-x/2) dx from 0 to infty
	j) integral x*e^(-x^2) dx from 0 to infty
	k) integral cos^2 x dx from -infty to 0
	o) integral x/(x^2+1) dx from -infty to infty
	p) integral 1/(x^2+4x+9) dx from -infty to infty

18.1	d) integral 1/(x^(1/3)) dx from -8 to 1
	i) integral (x+1)/(sqrt(4-x^2)) dx from 0 to 2
	j) integral 1/sqrt(|x|) dx from -1 to 4
	l) integral ln |x| / x dx from -1 to 1
	q) integral 4x/sqrt(1-x^4) dx from 0 to 1
	r) integral 1/(x*sqrt(1-x^2)) dx from 0 to 1
	s) integral tan x dx from 0 to pi	
	t) integral cos x/sqrt(sin x) dx from 0 to pi/2

18.5	plot 1/2 where x=-1..1
	mu = integral 1/2*x dx from -1 to 1
	sigma^2 = integral x^2*1/2 dx from -1 to 1
	n arvu: P(-0.5<= KV <= 0.5) = integral sqrt((3*10)/(2*pi))*e^(-x^2/2*3*10) dx from -0.5 to 0.5

18.6	integral 1/(15*sqrt(2*pi))*e^(-(x-100)^2/(2*15*15)) dx from 85 to 115
	integral 1/(15*sqrt(2*pi))*e^(-(x-100)^2/(2*15*15)) dx from 140 to infty