A:7
B:﹣10
C:10
D:﹣3
如图表示有丝分裂细胞周期,下列选项中能正确表示一个完整细胞周期的是( )
Flags have existed for over 3,000 years. The earliest flags were wooden or metal poles with a carving. About 2,000 years ago pieces of fabric were added to some poles for decoration. Over the next 500 years the free-flying part of the flag became more important.
若α∈(π2,π),则3cos2α=sin(π4﹣α),则sin2α的值为( )