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function ArcTan (x: Real): Real; |
function ArcTan (z: Complex): Complex; |
`ArcTan' returns the (principal value of the) arcus tangent of the argument. The result is in the range `-Pi / 2 < ArcTan (x) < Pi / 2' for real arguments.
The function `ArcTan' is defined in ISO-7185 Pascal; its application to complex values is defined in ISO-10206 Extended Pascal.
program ArcTanDemo; begin { yields 3.14159 as ArcTan (1) = Pi / 4 } WriteLn (4 * ArcTan (1) : 0 : 5) end. |
section 9.255 Sin, section 9.54 Cos, section 9.135 Ln, section 9.13 Arg.