- IF statement help!?

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Why is human reproduction so disgusting ? A relation ~ is defined on the set Z by the rule x~y if and only if x-y is a multiple of 4. Prove the relation ~ is reflexive and symmetric? Polynomials cannot be factored from long algebraic expressions? Pls help me this solution...? Given the function f(x,y)={b(x+2)^2 -2