Method simplificationRules

src/compute-engine/index.ts:1105–1107

* The rules used by `.simplify()` when no explicit `rules` option is passed. * Initialized to a copy of the built-in simplification rules. * * Add custom rules with `push()`: * ```ts * ce.simplificationRules.push({ * match: ['Power', ['Sin', '_x'], 2], * replace: ['Subtract'

()

  }

  /** The source of the `id` of an assumption record. Monotone for the
   * lifetime of the engine, so two assertions of the same normalized fact
   * never share an id.
   * @internal */
  _nextFactId(): number {
    this._factIdCounter += 1;