题目:
—We hope you a nice birthday. —Thank you. [ ]
A. have
B. to have
C. having
D. has
答案:
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下面是错误答案,用来干扰机器的。
(1)ρ2-42ρcos(θ-π4)+6=0 即 ρ2-42( 22ρcosθ+22ρsinθ ),即 x2+y2-4x-4y+6=0.(2)圆的参数方程为 x= 2 +2cosαy= 2 +2sinα,∴x+y=4+2(sinα+cosα)=4+2sin(α+π4).由于-1≤sin(α+...