题目:
In the reading-room, we found Winifred ____at a desk, with her attention _____on a novel.
A.sitting; fixing
B.seating; fixed
C.sitting; fixed
D.seated; fixing
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ)f(x)=3sin(ωx+φ)-cos(ωx+φ)=2[32sin(ωx+φ)-12cos(ωx+φ)]=2sin(ωx+φ-π6). f(x)为偶函数,∴对x∈R,f(-x)=f(x)恒成立,∴sin(-ωx+φ-π6)=sin(ωx+φ-π6).即-sinωxcos(φ-π6)+cosω...