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The line joining A(bcosalphabsinalpha) a...

The line joining `A(bcosalphabsinalpha)` and `B(acosbeta,asinbeta)` is produced to the point `M(x ,y)` so that `A M` and `B M` are in the ratio `b : adot` Then prove that `x+ytan(alpha+beta/2)=0.`

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