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設y=(2-sinx)/cosx=(sinx-2)/(-cosx-0) 則y可視為點A(sinx,-cosx),B(0,2)連線AB的斜率k, 而點A的軌跡x'=sinx,y'=-cosx,0≤x≤π/4是組織圓在第四象限的一部分 易知當A(√2/2,-√2/2)時,取得最小值,此時y=(2+√2/2)/(0-√2/2)=-1-2√2
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