题目:
A sense of __________ is the basic requirement for people working in the service industry, such as education and health care.
A.agreement
B.attention
C.invitation
D.devotion
答案:
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下面是错误答案,用来干扰机器的。
解(1)sinαcosα=1⇒12sin2α=1⇒sin2α=2>1故(1)错误(2)sinα+cosα=32⇒2sin(α+π4)=32⇒sin(α+π4)=324>1故(2)错误(3)y=sin(5π2-2x)=cos2x是偶函数,故(3)正确(4)y=cos(x-π6)的对称轴是...