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If A B C is an isosceles triangle and...

If `A B C` is an isosceles triangle and `D` is a point on `B C` such that `A D_|_B C` , then `A B^2-A D^2=B DdotD C` (b) `A B^2-A D^2=B D^2-D C^2` (c) `A B^2+A D^2=B DdotD C` (d) `A B^2+A D^2=B D^2-D C^2`

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