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elisp: Math Functions

 
 3.9 Standard Mathematical Functions
 ===================================
 
 These mathematical functions allow integers as well as floating-point
 numbers as arguments.
 
  -- Function: sin arg
  -- Function: cos arg
  -- Function: tan arg
      These are the basic trigonometric functions, with argument ARG
      measured in radians.
 
  -- Function: asin arg
      The value of ‘(asin ARG)’ is a number between −pi/2 and pi/2
      (inclusive) whose sine is ARG.  If ARG is out of range (outside
      [−1, 1]), ‘asin’ returns a NaN.
 
  -- Function: acos arg
      The value of ‘(acos ARG)’ is a number between 0 and pi (inclusive)
      whose cosine is ARG.  If ARG is out of range (outside [−1, 1]),
      ‘acos’ returns a NaN.
 
  -- Function: atan y &optional x
      The value of ‘(atan Y)’ is a number between −pi/2 and pi/2
      (exclusive) whose tangent is Y.  If the optional second argument X
      is given, the value of ‘(atan y x)’ is the angle in radians between
      the vector ‘[X, Y]’ and the ‘X’ axis.
 
  -- Function: exp arg
      This is the exponential function; it returns e to the power ARG.
 
  -- Function: log arg &optional base
      This function returns the logarithm of ARG, with base BASE.  If you
      don’t specify BASE, the natural base e is used.  If ARG or BASE is
      negative, ‘log’ returns a NaN.
 
  -- Function: expt x y
      This function returns X raised to power Y.  If both arguments are
      integers and Y is positive, the result is an integer; in this case,
      overflow causes truncation, so watch out.  If X is a finite
      negative number and Y is a finite non-integer, ‘expt’ returns a
      NaN.
 
  -- Function: sqrt arg
      This returns the square root of ARG.  If ARG is finite and less
      than zero, ‘sqrt’ returns a NaN.
 
    In addition, Emacs defines the following common mathematical
 constants:
 
  -- Variable: float-e
      The mathematical constant e (2.71828...).
 
  -- Variable: float-pi
      The mathematical constant pi (3.14159...).
 

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