(a2 - b2) (x2 - y2) + 4abxy এর উৎপাদক কত?

• ক (ax - by - ay + bx) (ax - by + ay - bx)
• খ (ax + by + ay + bx) (ax - by - ay + bx)
• গ (ax + by + ay - bx) (ax + by - ay + bx) ✅ সঠিক উত্তর
• ঘ (ax - by + ay - bx) (ax + by - ay - bx)