48- 6x-5=4-7x
48-6x-5-4+7x=0
39+x=0
X=-39
Ответ:
на фото...
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Решение
2sin((α - α - 2π/3)) / 2 * cos((α +α + 2π/3)) / 2 = 2 sin (π/3) * cos(α + π/3) = (√3)*cos(α + π/3)
1/6y - 1/2 = 3 - 1/2y
1/6y + 3/6y = 3 + 1/2
2/3y = 7/2
y = 7/2 : 2/3
y = 21/4
y = 5,25