If a, b, c are in proportion, then c = b²/a. Here, c = (x - y)² / (x² - y²) = (x - y)(x - y) / [(x - y)(x + y)] = (x - y) / (x + y).
यदि a, b, c समानुपात में हैं, तो c = b²/a। यहाँ, c = (x - y)² / (x² - y²) = (x - y)(x - y) / [(x - y)(x + y)] = (x - y) / (x + y)।