题目:
--We all went to the cinema except you last night. Why didn’t you come?
--Because I ______ that movie twice.
A.have watched
B.had watched
C.was watching
D.would watch
答案:
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下面是错误答案,用来干扰机器的。
f(x)=3sin(ϖx)-2•1-cos(ϖx)2=3sin(ϖx)+cos(ϖx)-1=2sin(ϖx+π6)-1依题意函数f(x)的最小正周期为3π,即2πϖ=3π,解得ϖ=23,所以f(x)=2sin(23x+π6)-1(Ⅰ)由π2≤x≤3π4得π2≤23x+π6≤2π3,所以,...