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## Sum and Difference Formulas:There are four possible products of two factors that can be formed from , , , and . Namely: , , , . Note their distribution in the first four formulas. The right hand sides of (1) and (2) consist of the algebraic sum of and , while (3) and (4) consist of the mixed products. Note the distribution of signs below. In formulas 1 and 2, for In formulas 3 and 4, for Formulas 5 and 6, |
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