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NAMEatan, atanf, atanl - arc tangent function
DESCRIPTIONThe fBatan()fP function calculates the arc tangent of fIxfP; that is the value whose tangent is fIxfP.
RETURN VALUEThe fBatan()fP function returns the arc tangent in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive).
CONFORMING TOSVID 3, POSIX, BSD 4.3, ISO 9899. The float and long double variants are C99 requirements.
SEE ALSOacos(3), asin(3), atan2(3), cos(3), sin(3), tan(3)