A:a>b>c
B:a>c>b
C:c>a>b
D:b>c>a
He didn't ____ (watch) a football game yesterday.
已知函数f(x)=x3+x,且f(3a﹣2)+f(a﹣1)<0,则实数a的取值范围是____
已知函数f(x)的导函数为f′(x),若fx=f'π9sin3x+cos3x,则f'π9=____