Function fp

test/compute-engine/rubi-utils.test.ts:447–447

(v: number)

  });

  test('D(tan)=sec² divides sec² → 1 (∫sec²·tan^m)', () => {
    expect(dd(['Tan', 'x'], ['Power', ['Sec', 'x'], 2]).isSame(1)).toBe(true);
  });