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December 21, 2014

December 21, 2014

Posted by **Anonymous** on Tuesday, February 19, 2013 at 11:42am.

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

- maths-urgently needed -
**Steve**, Tuesday, February 19, 2013 at 3:37pmobviously any multiple of pi/2 will work

Also, since

sin pi/5 = sin 4pi/5 = 1/√8 (5-√5)

sin 2pi/5 = sin 3pi/5 = 1/√8 (5+√5)

any multiple of pi/5 will also work.

So,

x = pi(n/2)

x = pi(2n/5)

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