I tried Desmos but it only takes definite integrals (which doesn't make sense to me because a definite integral is a number not a function, but anyways). Is there anything that lets you graph an antiderivative? Say for example if I wanted to graph $\int 2x\,dx$ (and that should show me the graph of $x^2$).
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$\begingroup$I highly recommend this tool: .
I use this all the time for integrating: it can do definite and indefinite integrals. If you scroll down once you submit an integral to be computed there is a graph which has the integrand and the indefinite integral plotted (so for your example: the graph shows the plot of $y=2x$ and $y=x^2$). Since indefinite integrals are only defined up to a constant shift, you can specify this constant shift $C$ in the graph (it is $C=0$ by default).
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