Function closesLatex

test/compute-engine/rubi-utils.test.ts:609–622

(latex: string, subs: Record<string, number>)

    expect(sameNumerically(sp, p)).toBe(true);

    const binom = ce.box(['Add', 2, ['Multiply', 3, ['sec', arg]]] as any); // 2 + 3·sec
    const sb = cofunctionShift(ce, binom, 'x');
    expect(sb.toString().includes('csc')).toBe(true);
    expect(sameNumerically(sb, binom)).toBe(true);
  });

  test('composes with deactivateTrig: active Sec deactivates + reflects to csc', () => {
    const active = ce.box(['Power', ['Sec', arg], 3] as any); // Sec[a+b x]^3
    const shifted = cofunctionShift(ce, deactivateTrig(ce, active), 'x');
    expect(shifted.toString().includes('csc')).toBe(true);
    expect(sameNumerically(shifted, active)).toBe(true);
  });

  test('leaves a MIXED cross-pair integrand (sin·sec) untouched', () => {
    // sin co-present ⇒ uniform +π/2 would desync arguments; unifyInertTrig owns it
    const mixed = ce.box(['Multiply', ['sin', arg], ['sec', arg]] as any);
    expect(cofunctionShift(ce, mixed, 'x')).toBe(mixed);