题目:
The book is yours. That one is .[ ]
A. I
B. my
C. mine
D. me
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ) sin(2x+π6)=sin2xcosπ6+cos2xsinπ6,sin(2x-π6)=sin2xcosπ6-cos2xsinπ6,cos2x=12(cos2x+1)∴f(x)=sin(2x+π6)+sin(2x-π6)+2cos2x=sin2xcosπ6+cos2xsinπ6+sin2xcosπ6-cos2xsinπ6+cos2x+1=3sin...