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Answer this QUESTION CORRECTLY. show Complete Solutions. Thanks you (1) Prove that the product xy of two real numbers x and y is nonnegative if

Answer this QUESTION CORRECTLY. show Complete Solutions. Thanks you

(1) Prove that the product xy of two real numbers x and y is nonnegative if and only if the absolute value (x + yl of their sum is the sum (x| + ly) of their absolute values

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