html – Rendering a table within a textarea-ThrowExceptions

Exception or error:

I am attempting to code my own version of the equation input on this website, as I am working on my own solver for matrices and matrix equations:

It can be observed that users are able to input matrices of different sizes into a text area, which are rendered as tables. However, when I attempt to do the same in my own code, it simply renders [object Object].

How can I achieve this functionality?

import React from 'react';

const Solver = () => {
    return (



export default Solver;
How to solve:

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