Enter a function and domain to compute a numerical approximation to the corresponding definite integral along with a graph representing the integral.
$\displaystyle \int_a^b f(x) \, dx \approx$ ?
See what Wolfram|Alpha has to say
The input mathematical expressions are parsed using math.js.
Some numerical computations, including the integral itself, are performed by numeric.js. Strictly speaking, numeric.js does not (directly) provide a numeric integration routine. It does, however, have a fairly general ODE solver using the Dormand-Prince method or DOPRI. Thus, the integrator works by solving the ODE $y'=f(x)$ with initial condition $y(a)=0$ and then evaluating the result at $x=b$.
The graph is produced by D3 and basic DOM manipulation is provided by jQuery.