Help in Entering Equations
Entering Basic Equations
Always use x and y (or X and Y) as your equation variables. Be sure to include the equals sign, "=".
To enter an equation, you can use your computer keyboard interchangably with one of the calculator keypads.
You can use parentheses,
Terms in x and y may be entered as sums, differences, products, and quotients of numbers (coefficients) times powers in x and/or y. You can use "*" for multiplication, or in the case of a number times x, you can abbreviate, say, "3*x" by "3x" but not "x3"; also, "x*y" cannot be abbreviated to "xy".
Coefficients may be entered as integers (like 2 or
Use pi for π (approximately 3.14) and e for the
base e (approximately 2.72) of natural logarithms.
Entering Intermediate and Advanced Equations
When entering any function with an abbreviated name, like sin for sine, the argument (term in x) following the name needs to be enclosed in paired parentheses. So, "sinx" is incorrect, as is "sin(x", but "sin(x)" is correct.
Logarithmic Functions. Logarithmic
functions can be entered with one argument, as in
For further illustrations of valid input, see how equations are entered in the Basic Equation Plotting Examples.
Just like a math textbook, every once in a while we publish an error. If you