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How do I prove the following equations?
Let's start with a general overview.
To prove these equations, you need to use algebraic identities. In this case, you will use the identity for the squares of binomials. This identity states that (a+b)^2 = a^2 + 2ab + b^2 and (a-b)^2 = a^2 - 2ab + b^2.