已知点M(rcosα,rsinα),N(rcosβ,rsinβ),(-π/2_数学解答

已知点M(rcosα,rsinα),N(rcosβ,rsinβ),(-π/2

人气：127 ℃　时间：2020-04-15 07:53:23

解答

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)