Maths formula for differential calculus
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( a + b )^2 = a^2 + b^2 + 2ab
( a - b )^2 = a^2 + b^2 - 2ab
a^2 - b^2 = ( a + b ) ( a - b)
( a - b )^2 = a^2 + b^2 - 2ab
a^2 - b^2 = ( a + b ) ( a - b)
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