EXAMPLE 1. - Find the sum of x2 - 3y2 2x 2y + 3 , 3x2 5xy + 5y2 + x + . - - - 3xy + y2 + x + y 1 , 2x2 + 4xy 4y2 + 3x + 4y - 2 , and 6x2 + 10xy SOLUTION .
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