The tangent of a polynomial written in JavaScript!
The polytan module contains a function that finds the tangent line to a polynomial equation. The function takes an array of coefficients in ascending order and the x-coordinate of the point where the tangent touches the polynomial.
const calculate = require('polytan')
// f(x) = x^2 - 2x + 1
// touching point = (2, f(2))
console.log(calculate([1, -2, 1], 2))
// { slope: 2, intercept: -3 }
// g(t) = 2x - 3