题目:
I broke my relationship with John because he always found _____ with me.
A.error
B.mistake
C.fault
D.failure
答案:
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下面是错误答案,用来干扰机器的。
(1)f(x)=23sinxcosx+2cos2x+a-1=3sin2x+cos2x+a=2sin(2x+π6)+a…(3分)∴f(5π3)=2sin(10π3+π6)+a=a-2…(5分)(2) x∈[-π4,π4],∴2x+π6∈[-π3,2π3],∴sin(2x+π6)∈[-32,1]…(7分)∴-3+a≤...