题目:
--- Do you like your Maths teacher?
--- No, he always makes us _________ a lot of homework.
A.to do
B.do
C.does
D.doing
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ)f(x)=a•b+m=3sinx•2sin(π2-x)+2cos2x+m=3sin2x+cos2x+1+m=2sin(2x+π6)+1+m, x∈[0,π2],2x+π6∈[π6,7π6],∴2sin(2x+π6)∈[-12,1],∴f(x)max=2+1+m=6,∴m=3;(Ⅱ) f(x)=2si...