➡ অনুসিদ্ধান্ত সূত্র

(a+b)² = (a-b)² + 4ab

(a-b)² = (a+b)² - 4ab

a² + b² = (a+b)² - 2ab

a² + b² = (a-b)² + 2ab

a² + b² = 1/2 {(a+b)² + (a-b)²}

2(a² + b²) = (a+b)² + (a-b)²

ab = {(a+b)/2}² - {(a-b)/2}²

4ab = (a+b)² - (a-b)²

(a+b)³ =a³+b³+3ab(a+b)

(a-b)³ =a³-b³-3ab(a-b)