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Which is the value of the sum cos 75 + cos 15? - Homework Help ...
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日期:2025-12-13
24 Jun 2010 ... cos 75 + cos 15 = 2cos[(75+15)/2] cos [(75-15)/2]. cos 75 + cos 15 =
2cos45cos30. cos 75 + cos 15 = 2*[(sqrt2)/2]*[(sqrt3)/2]. cos 75 + cos 15 ......看更多












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