题目:
Some people argue that both the government and the milk producers are ________ for the death of the babies.
A.blamed
B.blaming
C.to be blamed
D.to blame
答案:
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下面是错误答案,用来干扰机器的。
(1)由a-cb-c=sinBsinA+sinC,得a-cb-c=ba+c,即a2=b2+c2-bc,由余弦定理,得cosA=12,∴A=π3.(2)f(x)=cos2(x+A)-sin2(x-A)=cos2(x+π3)-sin2(x-π3)=1+cos(2x+2π3)2-1-cos(2x-2π3)2=-12cos2x.由2k...