Inprotaint mathematic

☞ (a+b)²= a²+2ab+b²

.

☞ (a+b)²= (a-b)²+4ab

.

☞ (a-b)²= a²-2ab+b²

.

☞ (a-b)²= (a+b)²-4ab

.

☞ a² + b²= (a+b)²-2ab.

.

☞ a² + b²= (a-b)²+2ab.

.

☞ a²-b²= (a +b)(a -b)

.

☞ 2(a²+b²)= (a+b)²+(a-b)²

.

☞ 4ab = (a+b)²-(a-b)²

.

☞ ab = {(a+b)/2}²-{(a-b)/2}²

.

☞ (a+b+c)² = a²+b²+c²+2(ab+bc+ca)

.

☞ (a+b)³ = a³+3a²b+3ab²+b³

.

☞ (a+b)³ = a³+b³+3ab(a+b)

.

☞ a-b)³= a³-3a²b+3ab²-b³

.

☞ (a-b)³= a³-b³-3ab(a-b)

.

☞ a³+b³= (a+b) (a²-ab+b²)

.

☞ a³+b³= (a+b)³-3ab(a+b)

.

☞ a³-b³ = (a-b) (a²+ab+b²)

.

☞ a³-b³ = (a-b)³+3ab(a-b)