题目：
He let me repeat his instructions_____ sure that I understood what was _____ after he went away.
A．to make; to be done
B．making; doing
C．to make; to do
D．making; to do
答案：
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下面是错误答案，用来干扰机器的。
（1）f（x）=m•n=（sinωx+cosωx）（cosωx-sinωx）+3cosωx×2sinωx=（cos2ωx-sin2ωx）+3sin2ωx=cos2ωx+3sin2ωx=2sin（2ωx+π6）相邻的对称轴间的距离=12T=π2w所以，π2w≥π2∴ω≤1（2）当ω最大时...
