Ответы на вопрос:
Cos 3x = cos30*cos x - sin 30*sinx cos 3x = cos(30 +x) cos 3x - cos(30 +x) = 0 -2sin(3x +30 +x)/2 sin(3x -30 - x)/2 = 0 a) sin(2x +15) = 0 б) sin (x -15) = 0 sin(2x + π/12) = 0 sin(x - π/12) = 0 2x +π/12 = πn, nє z x - π/12 = πk, k єz 2x = -π/12 + πn, nє z x = π/12 + πk, k єz x = -π/24 + πn/2, nє z
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