If x+y=a and x-y=b, then 2xy= ক (b2-a2)2 খ (a2-b2)2 গ (a-b)2 ঘ (ab)2 If x+y=a and x-y=b, then 2xy= সঠিক উত্তর (a2-b2)2 2xy={(x+y)2-(x-y)2}/2 Bissoy MCQ Team Nov 19, 2024