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step1:數形結合,劃出平面直角坐標系,將(cos x,sin x)當做以(0,0)為心的組織圓上的任何一點.step2:找出點(-2,-1)step3:圓上任意一點(cos x,sin x)與(-2,-1)的相連,該線段所在直線的斜率可表示為k=[sinx+…
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