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18.6, 18.7, 18.8 под буквой в!

1)sinx = t, -1 ≤ t ≤ 14t² + 11t - 3 = 0D = 121 + 48 = 169t₁ = (-11-13)/8 = -3 < - 1 - не удовлетворяет ОДЗt₂ = (-11 + 13)/4 = 0.5sinx = 0.5x = (-1)ⁿ * π/3 + πn, n∈Z2)cosx = t, -1 ≤ t ≤ 12t² - t - 3 = 0D = 1 + 24 = 25t₁ = (1+5)/4 = 6/4 > 1 - не удовлетворяет ОДЗt₂ = (1 - 5)/4 = -1cosx = -1x = π + 2πn, n∈Z3)cos²x = 1 - sin²x5 - 5sin²x + 6sinx - 6 = 05sin²x - 6sinx + 1 = 0sinx = t, -1 ≤ t ≤ 15t² - 6t + 1 = 0D = 36 - 20 = 16t₁ = (6+4)/10 = 1t₂ = (6-4)/10 = 0.2sinx = 1x₁ = π/2 + 2πn, n∈Zsinx = 0.2x₂ = (-1)ⁿarcsin(0.2) + πn, n∈Z0 ≤ arcsin(0.2) ≤ π/2