atan

Format: atan( x )

Arguments: (num) x Any real or complex number

Returns: (num) The arc tangent of x in radians

Description: The arc tangent of x is defined as the angle (in radians) whose tangent is x.

Examples: atan(-0.5) = -0.464

atan(1)/deg = 45  (degrees)

atan(1+I) = 1.017+0.402i

tan(atan(10)) = 10

See Also: atan2, asin, acos, sin, cos, tan, PI