Method activate

src/compute-engine/rubi/driver.ts:221–224

(e: Expression | null)

    : ce.function(e.operator, newOps);
  const step = simplifyTrig(node as any);
  return (step?.value as Expression) ?? node;
}

/**
 * One recorded integration step, captured by the driver only when a `records`
 * accumulator is threaded through `int()` (i.e. under `explain('Integrate')`).
 *