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Can the relation cos theta =(x^2+y^2+z^2...

Can the relation `cos theta =(x^2+y^2+z^2)/(xy+yz+zx)` be true for three unequal positive real numbers x,y,z,? Justify your answer.

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The correct Answer is:
Therefore , `cos theta =(x^2+y^2+z^2)/(xy+yz+zx)` is impossible for three unequal positive real number x, y and z.
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