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(guile.info)Primitive Numerics

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Primitive Numeric Functions
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Many of Guile's numeric procedures which accept any kind of numbers as
arguments, including complex numbers, are implemented as Scheme
procedures that use the following real number-based primitives.  These
primitives signal an error if they are called with complex arguments.

 - primitive: $abs x
     Return the absolute value of X.

 - primitive: $sqrt x
     Return the square root of X.

 - primitive: $expt x1 x2
     Return X1 raised to the power of X2.

 - primitive: $sin x
     Return the sine of X.

 - primitive: $cos x
     Return the cosine of X.

 - primitive: $tan x
     Return the tangent of X.

 - primitive: $asin x
     Return the arcsine of X.

 - primitive: $acos x
     Return the arccosine of X.

 - primitive: $atan x
     Return the arctangent of X in the range -PI/2 to PI/2.

 - primitive: $atan2 y x
     Return the arctangent of Y/X, using the signs of X and Y to
     determine the quadrant of the result.

 - primitive: $exp x
     Return e to the power of X, where e is the base of natural
     logarithms (2.71828...).

 - primitive: $log x
     Return the natural logarithm of X.

 - primitive: $sinh x
     Return the hyperbolic sine of X.

 - primitive: $cosh x
     Return the hyperbolic cosine of X.

 - primitive: $tanh x
     Return the hyperbolic tangent of X.

 - primitive: $asinh x
     Return the hyperbolic arcsine of X.

 - primitive: $acosh x
     Return the hyperbolic arccosine of X.

 - primitive: $atanh x
     Return the hyperbolic arctangent of X.