ObjectPascal ArcTan Function The Arc Tangent of a number, returned in radians System unit

function ArcTan ( const Number : Extended ) : Extended;

Description The ArcTan function is a mathematical function giving the value in radians of the Arc Tangent of Number.   PI radians  = 180 degrees Notes The System unit supports only the following angular functions: ArcTan Sin Cos Special floating point values INF, -INF yield +PI/2 and -PI/2 respectively. Related commands ArcCos The Arc Cosine of a number, returned in radians ArcSin The Arc Sine of a number, returned in radians Cos The Cosine of a number Sin The Sine of a number Tan The Tangent of a number		Example code : Get the ArcTan of PI/2 var   float : single; begin   // The ArcTan of PI/2 should give 1.0   float := ArcTan(PI/2);   WriteLn('ArcTan of PI/2 = '+FloatToStr(float)); end; Show full unit code    ArcTan of PI/2 = 1.00388479232788