p ( x,y )  x to the y power (x must be positive)
                  you should use this if the power can be fractional
		  however when x is negative it may not be right
       sqrt ( x ) The  square  root of x.          press BACK for calculator
       sin or s ( x )  The sine of x in radians.
       cos or c ( x )  The cosine of x in radians.
       atan or a ( x )  The arctangent of x.
       ln or l ( x )  The natural logarithm of x.
       log ( x )  The common logarithm of x.
       exp or e ( x )  The exponential function of raising e to the  value x.
       j ( n,x ) The bessel function of integer order n of x.

       The calculator automatically inserts * between a number and an
       alphabet letter (a-zA-Z) and between and number and a (.  
       It also automatically replaces - followed by a letter or ( with
       -1* .  This will allow most algebraic expressions in an intuitive
       way.  However avoid putting spaces in your expression or odd
       things may happen.

       expr + expr
       expr - expr
       expr * expr
       expr / expr
              The  result  of the expression is the sum, difference 
	      product or quotient respectively of the two expressions.
       expr ^ expr
              The result of the expression is the  value  of  the
              first  raised  to the second. The second expression
              must be an integer.  
       ( expr )
              This alters the standard precedence  to  force  the
              evaluation of the expression.