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2x=t
sin t=√3/2
t=π/3 + 2kπ lub t= π- π/3 + 2kπ
t= 2/3π + 2kπ ; k ∈ C
2x=t
x=π/6 + 2kπ lub x=π/3 + 2kπ ; k ∈ C