若sinx

问题描述:

若sinxA,(2kπ+π/6,2kπ+5π/6)
B,(2kπ+5π/6,2kπ+π/6)
C,(2kπ-7π/6,2kπ+π/6)以上k属于Z

肯定是小于30° 大于150°的角
应该选C