已知A(0,a),B(0,b)是Y轴正正半轴上两点0,
问题描述：
已知A(0,a),B(0,b)是Y轴正正半轴上两点0,
数学人气：115 ℃时间：2020-06-22 19:54:19
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设直线AC和BC的倾斜角分别为α,β.tanα = (a-0)/(0-x) = -a/xtanβ = (b-0)/(0-x) = -b/x显然角ACB一定是锐角 = α-βf(x)= tan(α- β) = (tanα - tanβ)/(1 + tanα*tanβ) = (-a/x + b/x)/(1 + ab/x²)= (b...
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设直线AC和BC的倾斜角分别为α,β.tanα = (a-0)/(0-x) = -a/xtanβ = (b-0)/(0-x) = -b/x显然角ACB一定是锐角 = α-βf(x)= tan(α- β) = (tanα - tanβ)/(1 + tanα*tanβ) = (-a/x + b/x)/(1 + ab/x²)= (b...