Evaluate (a + b)(c – d) + (a – b) (c + d) + 2(ac + bd)
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+ a + b(c - d) + (a - b) (c + d) + 2(ac + bd)
+ a + b - c - d + (a - b) (c + d) + 2 (ac + bd)
+ a + b - c - d - a - b (c + d) + 2 (ac + bd)
+ a + b - c - d - a - b - c + d + 2 (ac + bd)
+ a + b - c - d - a - b - c + d + 2 + ac + bd
= -c4,ac,bd
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