设0
人气:462 ℃ 时间:2020-01-30 22:43:33
解答
L是长度,则L^2=(COSθ-2-SINθ)^2 + (SINθ-2+COSθ)^2=2(COSθ-2)^2+2(SINθ)^2
= 2(COSθ)^2 +8-8COSθ +2(SINθ)^2=10-8COSθ
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