In any DeltaABC, if D be any points of t...

In any `DeltaABC,` if D be any points of the base BC such that `(BD)/(DC)=m/n and angle ABD =alpha, angle DAC =beta,angle CDA=thetaand AD=x` then prove that
`(m+n) ^(2). x =(m+n) (mb^(2) +nc^(2))-mna^(2)`

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