Performing Special Functions

  Calculator performs special functions including trigonometric
  and inverse trigonometric functions.  The special functions
  keys are as follows:

  Key       Description
  deg        Degree key. Selects the units for angular measurement. By
            default, Calculator is in the degree mode.  Clicking on the
            deg key once places Calculator in the radian mode, which
            is indicated by the key label changing to "rad." Clicking on
            the key again places Calculator in gradian mode, which is
            indicated by the key label changing to "grad." The angular
            mode has no effect on Calculator unless the trigonometric
            functions are being used.

  x!        Factorial key. Calculates the facto(~)(~ ~1)(~ ~2)~~(1)
            of the value x in the display for integers.

  1/x        Reciprocal key.  Divides the displayed value x into 1.  for
            x!=0.

  Rnd       Random number generator key.  Generates a random
            number between 1 and the integer of the display.  It does
            not generate negative numbers or numbers less than 1.

  Inv        Inversion key.  By default, Calculator performs noninverted
            trigonometric functions.  When you activate the inversion
            key by clicking on it (which is indicated by the key becoming
            darkened), Calculator performs inverted trigonometric
            functions.

  sin        Sine key.  Instructs Calculator to find the sine of the dis-
            played value.

  cos        Cosine key.  Instructs Calculator to find the cosine of the
            displayed value.

  tan        Instructs Calculator to find the tangent of the displayed
            value.

  log        Common logarithm key. Calculates the common logarithm
            (base 10) of the number x in the display for x > 0.

  ln        Natural logarithm key.  Calculates the natural logarithm
            (base e) of the number x in the display for x > 0.

  square    Square root key. Calculates the square root of the number x
  root      in the display. The x value cannot be negative.

  y^x        y to the xth power key.  Raises the displayed value y to the
            xth power.  Order of entry is y, y^x key, x.  The y value
            cannot be negative, but both x and y can be fractional.

  and       Logical and.

  or        Logical or.
  xor        Logical xor.

  nor        Logical nor.

  not        Logical not.

  neg       Logical neg.

  Additional topics:

  *   Performing Arithmetic Functions

  *   Calculating Square Roots

  *   Calculating Percentages

  *   Clearing the Displays

  *   Using Memory

  *   Undoing the Most Recently Performed Function

  *   Exiting Calculator

  *   Using Calculator's Menus

  *   Keyboard Special Function Keys

  *   Keyboard Memory Function Keys

  *   Overview of Calculator

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