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Home > Electronics Tutorials > C Language Tutorial > math.h - Trigonometry functions - atan

C Language Programming Library Reference Guide

math.h - Trigonometry functions - atan
Declaration: double atan(double x);

Returns the arc tangent of x in radians.

Range: The value of x has no range. The returned value is in the range of -p/2 to +p/2 (inclusive).
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