tanpil3

Usage

Library

Math Library (libm, -lm)

Overview

The tanpi(), tanpif(), and tanpil() functions compute the tangent of π × x and measure angles in half-cycles.

Return values

The tanpi(), tanpif(), and tanpil() functions returns tan(π × x). If x 2^(p - 1) where p is the floating–point precision of x, then the returned value is 0 and it has no significance.

Special values

tanpi(0)

returns 0.

tanpi(n)

returns 0 for positive integers n.

tanpi(n/2)

returns for n > 0 and raises an FE_INVALID exception.

tanpi(∞)

return an and raises an FE_INVALID exception.

tanpi()

return an and raises an FE_INVALID exception.