Function hasInertTrig

src/compute-engine/rubi/rubi-utils.ts:2269–2272

True if any node carries an INERT trig head (`sin`/`cos`/…). Underlies * Rubi's `InertTrigFreeQ` (the working-form purity test that gates many * Chapter-4 dispatch rules).

(e: Expression)

  }
  const split = splitMonoFactor(u, x);
  if (split === null || split.rest === null) return null;
  const { scale, exp: mExp, rest } = split;
  const gt = genTrinomialPartsX(rest, x);
  if (gt !== null) {
    return {
      a: scale.mul(gt.a).evaluate(),
      b: scale.mul(gt.b).evaluate(),