Quick start
- Type a function such as x^2 - 4. To draw several, separate them with a semicolon: sin(x); x/3.
- Set the x range you want to see, for example −10 to 10.
- Read the intercepts listed under the graph.
What you can plot
- Polynomials: x^3 - 3x
- Trig: sin(x), cos(2x), tan(x) (radians)
- Exponentials and logs: e^x, ln(x), log(x)
- Roots and absolute value: sqrt(x), abs(x)
Reading the graph
An x-intercept is where the curve meets the horizontal axis, so it is a solution of f(x) = 0. The y-intercept is the value of f(0). Where two graphs cross, their functions are equal, which is a quick visual way to solve an equation like sin(x) = x/3.
Tips for a clearer picture
If the graph looks flat or cut off, change the x range. Steep functions like e^x need a smaller window, while slow ones like ln(x) need a wider one.
Common questions
Can I plot more than two functions?
Yes. Add as many as you like, separated by semicolons.
Why does tan(x) show breaks?
tan(x) is undefined at odd multiples of π/2, so the curve jumps there.
Does it work in degrees?
It uses radians. For degrees, write sin(x*pi/180).