Simplify.
(a + b) (c – d) + (a – b) (c + d) + 2 (ac + bd)
Simplify.
(a + b) (c – d) + (a – b) (c + d) + 2 (ac + bd)
(a + b) (c – d) + (a – b) (c + d) + 2 (ac + bd)
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