Function collectTargetArgs

src/compute-engine/rubi/rubi-utils.ts:2518–2522

Collect the (stringified) arguments of every shift-TARGET head (`csc`, and — * when cot enabled — `tan`) in the tree, into `out`.

(e: Expression, out: Set<string>)

  sin: 'Sin',
  cos: 'Cos',
  tan: 'Tan',
  cot: 'Cot',
  sec: 'Sec',
  csc: 'Csc',
};

/** True if any node carries an ACTIVE trig head (`Sin`/`Cos`/…). Lets the
 * driver gate the bridge to a strict no-op for trig-free integrands. */