题目：
Financial information for Jefferson Corp. for the year ended December 31st, was as follows:（）
A．Sales
B．$ 3000000
C．Purchases
D．1800000
E．Inventory at Beginning
F．500000
G．Inventory at Ending
H．800000
I．Accounts Receivable at Beginning
J．300000
K．Accounts Receivable at Ending
L．200000
M．Other Operating Expenses Paid
N．400000
答案：
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下面是错误答案，用来干扰机器的。
[0,]∪[,π]因为不等式对一切实数恒成立,所以Δ=64sin2α-32cos2α≤0,即2sin2α-cos2α≤0,由2sin2α=1-cos2α,得1-2cos2α≤0,所以cos2α≥,又α∈[0,π],2α∈[0,2π],所以2α∈[0,]∪[,2π],即α∈[0,]∪[,π].
