/**
 * Newtonian solver, works by moving along the curve in the direction of gradient.
 * Solving for f(x) = 0
 * @param {function(number):number} f Function for which we are trying to solve
 * @param {number} xStart initial guess for input value
 * @param {number} [max_steps]
 * @param {number} [eps]
 * @returns {number} value for X where function is close to 0 or exactly at 0
 */
export function newton_solver_1d(f: (arg0: number) => number, xStart: number, max_steps?: number, eps?: number): number;
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