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(librep.info)Mathematical Functions

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Mathematical Functions
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 - Function: exp x
     Return `e' (the base of natural logarithms) raised to the power X.

 - Function: log x
     Return the natural logarithm of X. An arithmetic error is
     signalled if X is less than zero.

 - Function: sin x
     Return the sine of angle X; x is in terms of radians.

 - Function: cos x
     Return the cosine of angle X.

 - Function: tan x
     Return the tangent of angle X.

 - Function: asin x
     Return the arc sine of X (the value whose sine is X), in radians.

 - Function: acos x
     Return the arc cosine of X.

 - Function: atan x
     Return the arc tangent of X.

 - Function: sqrt x
     Return the non-negative square root of X. Currently, if X is
     negative, an arithmetic error is signalled.

 - Function: expt x y
     Returns X raised to the power Y.

     If X is negative and Y is a non-integer, then an arithmetic error
     is signalled (mathematically should return a complex number).