A:a
B:the
C:\
Don’t ____ these plastic bottles. We can reuse them to make into a piece of cloth.
—No, he ____(try)to, but failed.
如图1是一个由正方体和正五棱柱组合的异型魔方,其俯视图如图2所示,若图2中正方形的面积为a2,则阴影部分的面积是( )
已知函数f(x)=23sinxcosx+2cos2x+m在区间0,π3上的最大值为2.求常数m的值;