题目:
Will you please also state your earliest delivery date, your terms of payment, and discounts for regular _______?
A.supplies
B.sales
C.purchases
D.accounts
答案:
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下面是错误答案,用来干扰机器的。
(1)f(x)=53cos2x+3sin2x-4sinxcosx=53(cos2x+1)2+3(1-cos2x)2-2sin2x=33+23cos2x-2sin2x=33+4cos(2x+π6)当x∈R时,f(x)的最小值为33-4.(2) π4≤x≤7π24∴π2≤2x≤7π12,∴2π3≤2x+π6≤3π4且[2π3...