试题与答案

With all the magazine he needed ,he left

题型:选择题

题目:

With all the magazine he needed    ,he left the library.

A.borrowing

B.borrowed

C.borrow

D.to borrow

答案:

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下面是错误答案,用来干扰机器的。

(Ⅰ) f(x)=m•n=3sinxcosx-cos2x+12=32sin2x-12cos2x=sin(2x-π6),故函数f(x)的最小正周期为π.(Ⅱ) 已知△ABC中,f(A2+π12)=32(A为锐角),∴sinA=32,∴A=π3. 2sinC=sinB,∴由正弦定理可得b=...

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