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sin x + sin 2x + sin 3x = cos x + cos 2x...

`sin x + sin 2x + sin 3x = cos x + cos 2x + cos 3x ` if (i) `cosx=-1/2` (ii) `sin2x=cos2x` (iii) `x=npi/2+pi/8` (iv) `x=2npi+(2pi)/3`

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