আমরা জানি, ab = a+b22 - a-b22
∴ 2x + 3y 4x -5y = 2x + 3y + 4x-522 - 2x + 3y - 4x + 522 = 6x-2y22 - 8y-2x22 = 2 3x-y22 - 2 4y-x22 = 3x - y2 - 4y -x2
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