physics

if theta is the angle between unit vectors A bar and B bar, then (1-A bar.B bar)/(1 plus A bar.B bar) is equal to

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asked by raghavendra
  1. Define u=A.B=ABcosTheta

    the problem then is

    (1-u)/(1+u)=(1-u)^2/(1-u^2)

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    posted by bobpursley

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