Find the value of expression :
$36 x^{2} + 25 y^{2} - 60 x y$ .

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Solution

$36 x^{2} + 25 y^{2} - 60 x y = (6 x)^{2} + (5 y)^{2} - 2 (6 x) (5 y)$
$= (6 x - 5 y)^{2}$ .

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