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If x prop y and y prop z, then prove tha...

If `x prop y and y prop z`, then prove that : `(x^2+y^2+z^2) prop (xy+yz+zx)`.

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UNITED BOOK HOUSE-QUESTION PAPER 2018-Exercise
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  2. Answer any One question : Find the simplest value of : sqrt7(sqrt5 - ...

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