Use +, -, *, / and ^ for addition, subtraction, multiplication, division, and power, respectively. However the use of * is optional for multiplication. That is,

The gCalcD graphing calculator is progragmed to understand expressions such as x+-2, x---2, x/-2, x*-sin(x) which would otherwise be entered, rather tediously, as x+(-2),x-(-(-2)), x/(-2), x*(-sin(x)) With gCalcD it is not necessary to use the excessive parentheses. The artificial inelligent gCalcD makes it possible to type in expressions with minimal effort and if you make a syntax error it will give you a precise error message highlighting the error.

This graphing calculator distinguishes binary from unary - sign and ignores redundant unary - signs. That is ---1----x+---2*--x is understood by gCalcD and is replaced by -1 - -x + -2*x

Although a unary operator has precedence over a binary operator, for convenience, the binary operator ^ has been given precedence over the unary operator -. So, for example, -x2 can naturally be entered as -x^2

In addition to algebraic functions such as linear, quadratic and other polynomial and rational functions, you can use any of these predefined functions in your expressions. This includes power functions, logarithmic and exponential functions, special step functions such as floor and ceil, trigonometric functions and their inverses, and hyperbolic functions and their inverses. You can also use mathematical constants such as the number represented by e (= 2.718…; Euler's number, natural Logarithm base) and π (=3.14…; by typing pi or Alt+P or Ctrl+P) in function expressions.

When entering a formula containing numerators and denominators, or exponents (powers or radicals) make sure you enclose them with parentheses (it is always safe to do so even though in some instances it may not be necessary).

For example, the expression

is entered as (4x^(3x)+2)/(2x)