tanf(3) on FreeBSD

The text 87a5d26787a7, as FreeBSD 2.2.8-RELEASE, FreeBSD 2.2.7-RELEASE, FreeBSD 2.2.6-RELEASE, FreeBSD 2.2.5-RELEASE, FreeBSD 2.2.2-RELEASE shipped it.

tangent functions

tanf(3) on FreeBSD now