f（x）=sin（2x+派/6）+3/2,
最小正周期为 2π/2=π
单调增区间：
2x+π/6∈[2kπ-π/2,2kπ+π/2]
x∈[kπ-π/3,kπ+π/6]
单调减区间 ：
2x+π/6∈[2kπ+π/2,2kπ+3π/2]
x∈[kπ+π/6,kπ+4π/3]