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September 3, 2015
Posted by **Anonymous** on Monday, February 18, 2013 at 9:19am.

sin x + sin 2x + sin 3x + sin 4x = 0 ?

- maths -
**Steve**, Monday, February 18, 2013 at 10:20amsince you will wind up with a 4th-degree polynomial in sinx, it's gonna take some doing. Take a peek at wolframalpha.com