2 ltol - "leg to leg", third side of a right-angled triangle with
3 unit hypotenuse, given one other side
15 Returns sqrt(1 - x^2) to the nearest multiple of eps.
16 The default value for eps is epsilon().
19 > print ltol(0.4, 1e-6), hypot(0.5, 1e-6)
26 NUMBER *qlegtoleg(NUMBER *q1, *epsilon, BOOL wantneg)