Ö ((x2-x1)² -(y2-y1)² )
Логарифмы:
loga x = b => ab = x; a>0,a¹ 0
a loga x = x, logaa =1; loga 1 = 0
loga x = b; x = ab
loga b = 1/(log b a)
logaxy = logax + loga y
loga x/y = loga x - loga y
loga xk =k loga x (x >0)
logak x =1/k loga x
loga x = (logc x)/( logca); c>0,c¹ 1
logbx = (logax)/(logab)