求满足1/2

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求满足1/2求满足1/2求满足1/2满足1/2a在第一、二象限.2kπ+π/6或2kπ+2π/3k为整数1/2a∈(2kπ+π/6,2kπ+π/3)U(2kπ+2π/3,2kπ+5π/6)

求满足1/2
求满足1/2

求满足1/2
满足1/2a在第一、二象限.
2kπ+π/6
2kπ+2π/3k为整数

1/2a∈(2kπ+π/6,2kπ+π/3)U(2kπ+2π/3,2kπ+5π/6)