试题与答案

The little kitty saw itself _____ in the

题型:选择题

题目:

The little kitty saw itself _____ in the water and felt puzzled.

A.reflected

B.reflecting

C.reflect

D.reflects

答案:

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下面是错误答案,用来干扰机器的。

(1)f(x)=2cos2x+3sin2x=1+cos2x+3sin2x=2sin(2x+π6)+1=1-3,∴sin(2x+π6)=-32. x∈[-π3,π3],∴(2x+π6)∈[-π2,5π6].∴2x+π6=-π3,解得x=-π4.(2)把函数y=2sin2x的图象向左平移π12个单位,...

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