aattaann22() -- Mathematics Function (libm)

Calculate inverse tangent
#iinncclluuddee <mmaatthh.hh>
ddoouubbllee aattaann22(_n_u_m, _d_e_n) ddoouubbllee _n_u_m, _d_e_n;

aattaann22() calculates  the inverse  tangent of  the quotient of  its arguments
_n_u_m/_d_e_n. _n_u_m  and _d_e_n may be  any real numbers.  The result  will be in the
range [-pi,  pi].  The sign of  the result will have the  same sign as _n_u_m,
and the cosine will have the same sign as _d_e_n.

_E_x_a_m_p_l_e
For an example of this function, see the entry for hhyyppoott().

_S_e_e _A_l_s_o
eerrrrnnoo, lliibbmm
ANSI Standard, section 7.5.2.4
POSIX Standard, section 8.1
