x^2 - y^2Math brain teasers require computations to solve.Lester is very intent on finding a formula to calculate the difference between two squares but doesn't have any squared terms in it.
Eg: If x and y are two numbers with y>x then he wants to find a formula to calculate (y^2)-(x^2) which does not contain any x^2 or y^2 terms in it. He finds that there are two cases: a) when x and y are consecutive. b) when x and y are not consecutive. Can you help him find the formula? 
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