The Fourier Series
Applet Doesn't Work?
Enter functions as expression in terms of "x". Usual rules apply. For exponents use "^", e.g. "e^x".
Scroll the wheel to change the number of terms in the sum.
Good functions to try (non-specified coefficients are 0)
A linear function, such as f(x) = x;
f(x) = sin(x) + sin(10*x);
1 + x^2/4
x^3/100 + sin(x)