All identites of mathematics

1.	All identites of mathematics
Answer» 1. (a+b)^2 = a^2 + 2ab + b^2 2. (a-b)^2 = a^2 - 2ab + b^2 3. (a+b) (a-b) = a^2 - b^2 4. (a+b) (a+c) = x^2 + (a+b) x + ab 5. (a+b+c)^2 =a^2 +b^2 +c^2 +2ab +2bc +2ca 6. (x+y)^3 = x^3 + y^3 + 3xy (x-y) 7. (x-y)^3 = x^3 - y^3 - 3xy (x-y) 8. x^3 + y^3 + z^3 - 3xyz = (x+y+z) (x^2 + y^2 + z^2 - xy - yz - zx )

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