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@@ -101,25 +101,22 @@ exception is raised.
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\FPCexample{ex2}
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-\begin{function}{arcsinh}
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-\Declaration
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-Function arcsinh(x : float) : float;
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-\Description
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-
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-\Errors
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-\SeeAlso
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-\end{function}
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-
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-\FPCexample{}
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-
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-
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\begin{function}{arctan2}
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\Declaration
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Function arctan2(x,y : float) : float;
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\Description
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+\var{arctan2} calculates \var{arctan(y/x), and returns an angle in the
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+correct quadrant. The returned angle will be in the range $-\pi$ to
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+$\pi$ radians.
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+The values of \var{x} and \var{y} must be between -2\^{}64 and 2\^{}64,
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+moreover \var{x} should be different from zero.
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+On Intel systems this function is implemented with the native intel
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+\var{fpatan} instruction.
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\Errors
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+If \var{x} is zero, an overflow error will occur.
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\SeeAlso
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+\seef{arccos}, \seef{arccosh}, \seef{arcsinh}, \seef{arctanh}
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\end{function}
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\FPCexample{}
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@@ -140,13 +137,19 @@ Function arctanh(x : float) : float;
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\begin{function}{arsinh}
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\Declaration
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Function arsinh(x : float) : float;
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+Function arcsinh(x : float) : float;
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\Description
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+\var{arsinh} returns the inverse hyperbolic sine of its argument \var{x}.
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+The \var{arscsinh} variant of this function is supplied for \delphi
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+compatibility.
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\Errors
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+None.
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\SeeAlso
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+\seef{arccosh}, \seef{arccos}, \seef{arsin}, \seef{artanh}
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\end{function}
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-\FPCexample{}
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+\FPCexample{ex4}
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\begin{function}{artanh}
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@@ -715,4 +718,3 @@ Function variance(const data : array of float) : float;
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\FPCexample{}
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-
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michael