Question

hlo frnds


$( {x}^{2} + {y}^{2})( {a}^{2} + {b}^{2} ) = {( ax + by)}^{2} \: \: \\ prove \: that \frac{x}{a } = \frac{y}{b}$
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Answer 1

answer is above mentioned.

Answer 2

Here it is mate.
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