const { Stack } = require('@hypercubed/f-flat');
const f = new Stack();
f.eval(`
math: rcl use
core: rcl use
shuffle: rcl use
200 set-precision
nd: [ dup [ over + rot bi@ - ] dip / ] ; // forward difference approximation to the derivative
`).stack;
Setup f-flat with required modules and define the forward difference approximation to the derivative
f.eval(`
[exp] 1 1e-100 nd
`).stack[0].toString();
d(exp(x)) / dx => exp(x)
exp(x) | x = 1 => e
f.eval(`
clr
[ dup sqrt * ] -1 1e-100 nd
`).stack[0].toString();
d(x*sqrt(x))/dx => 3*sqrt(x)/2
3*sqrt(x)/2 | x = 1 => 3 / 2 * i
f.eval(`
clr
[ inv ] 0 1e-100 nd
`).stack[0].toString();
d(1/x)/dx => -1/x^2
-1/x^2 | x = 0 => -Infinity
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