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> Write sum as product?
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Write sum as product?
Write sum as product?
Posted at：
2014-06-09
cos 11x + cos 2x
Sum identity: cos u + cos v = 2 cos(?(u+v)) cos(?(u?v)) cos 11x + cos 2x = 2 cos(?(11x+2x)) cos(?(11x?2x)) = 2 cos(?(13x)) cos(?(9x)) Ans. = 2 cos(6.5x) cos(4.5x)
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