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P and Q are points on the sides C A a...

`P` and `Q` are points on the sides `C A` and `C B` respectively of ` A B C` , right angled at `C` . Prove that `A Q^2+B P^2=A B^2+P Q^2` .

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The correct Answer is:
`= PQ^(2)+AB^(2)`
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