The sine function (sin x) can only have values in the range between 1 and -1. Perhaps you can work it out from there.
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2sinx - sin3x = 0 2sinx - 3sinx + 4sin3x = 0 4sin3x - sinx = 0 sinx(4sin2x - 1) = 0 sinx*(2sinx - 1)(2sinx + 1) = 0 so sinx = 0 or sinx = -1/2 or sinx = 1/2 It is not possible to go any further since the domain for x is not defined.
Tan(3a_)(sqrt(2) / 2 )(sqrt(2)/2) + 0.5 Tan(3a) ( 2/4) + 1/2 Tan(3a) ( 1/2 + 1/2 ) Sin(3a) (1) / 2Cos(3a) + 1/2 Without beinf equated to anything this will not go any further.
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The exact value of 60 degrees would be 1/2. This is a math problem.
It is 3/13 - 2/13*i