m=(rsina-rsinb)/(rcosa-rcosb)
=(sina-sinb)/(cosa-cosb)
=[2cos(a/2+b/2)sin(a/2-b/2)]/[-2sin(a/2+b/2)sin(a/2-b/2)]
=-cot(a/2+b/2)
已知点M(rcosα,rsinα),N(rcosβ,rsinβ),(-π/2
已知点M(rcosα,rsinα),N(rcosβ,rsinβ),(-π/2
数学人气:717 ℃时间:2020-04-15 07:53:23
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