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Questions  >>  Olympiad-Math  >>  Class 9
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Q)

The perpendicular AD on the base BC of a $\Delta ABC$ intersects BC at D such that DB=3CD.Then $2(AB^2-AC^2)=$______

$\begin{array}{1 1}2BC^2\\3BC^2\\BC^2\\4BC^2\end{array} $

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