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      Math Functions

      abs      take absolute value of an int
      labs     take absolute value of a long
      acos     take arc cosine
      asin     take arc sine of a double
      atan     take arc tangent of a double
      cos      take cosine of a double
      exp      return e to the exponent
      fabs     take absolute value
      facos    take floating point arc cosine
      fasin    take floating point arc sine
      fatan    take floating point arc tangent
      fcos    take floating point cosine
      fexp    floating point exponent
      ffabs    return absolute value of float
      flog    take log of a float
      flog10   take log of a float (base 10)
      fpow     return float to power of anothe
      fsin     return sine of a float
      fsqrt    return square root of a float
      ftan     return tan of a float
      tan      return tangent of a double
      log      take log of a double
      log10   take log of a double (base 10)
      pow      return number to power of another
      sin      return sine of a double
      sqrt     return square root of a double
      rand     generate random number
      srand    set seed for random number

      _divs    signed long divide
      _divu    unsigned long divide
      _mods    signed long modulus
      _modu    unsigned long modulus
      _muls    unsigned long multiply
      _mulu    unsigned long multiply