25.1 d) integral 1/(x^(1/3)) dx from -8 to 1
     e) integral 2/sqrt(2-x) dx from 1 to 2
     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
     m) integral ln(x)^n/x dx from 1 to e
     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

25.5 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

25.6 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