9^Sinx = t
t + 1/t = 10/3 | *3t
3t² + 3 = 10t
3t² - 10t +3 = 0
t = (5+-√(25-9))/3 = (5+-4)/3
t₁ = 3 t₂ = 1/3
9^Sinx = 3 9^Sinx = 1/3
3^2Sinx = 3 3^2Sinx = 3^-1
2Sinx = 1 2Sinx = -1
Sinx = 1/2 Sinx = -1/2
x = (-1)ⁿ π/6 + nπ, n ∈Z x = (-1)ⁿ⁺¹π/6 + nπ, n ∈Z