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【简答题】
已知向量 a =(cosx，sinx)， b =(-cosx，cosx)， c =(-1，0)， (1)若x= ，求向量 a 与 c 的夹角； (2)当x∈ 时，求函数f(x)=2 a · b +1的最大值； (3)设f(x)=2 a · b +1，将函数y=f(x)的图象向右平移 个单位后，再将得到的图象上各点的横坐标伸长到原来的4倍，纵坐标不变，得到函数y=g(x)的图象，求y=g(x)的单调递减区间．
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举一反三
【简答题】please write down the names of Four Great Tragedies of Shakespeare's piece 麦克白 李尔王 奥赛罗 哈姆雷特
【单选题】I. Multiple choice ( 60 points in all, 12 for each ) Please select from the four choices of each item, the one that best answers the question or completes the statement, and make your choice of A.B.C...
A.
visionary / women
B.
romantic /men
C.
realistic / characters
D.
natural / figures
【单选题】--Father, you promised! --Well, ________.But it was you who did not keep your word first.
A.
so was I
B.
so did I
C.
so I was
D.
so I did
【单选题】 I wondered_____that made him so upset.
A.
how it was
B.
which did it
C.
what it was
D.
who did it
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