2 acot - inverse trigonometric cotangent
9 eps nonzero real, defaults to epsilon()
14 Returns the acot of x to a multiple of eps with error less in
15 absolute value than .75 * eps.
17 v = acot(x) is the number in (0, pi) for which cot(v) = x.
20 > print acot(2, 1e-5), acot(2, 1e-10), acot(2, 1e-15), acot(2, 1e-20)
21 .46365 .463647609 .463647609000806 .46364760900080611621
27 NUMBER *qacot(NUMBER *x, NUMBER *eps)
30 asin, acos, atan, asec, acsc, epsilon