Answer
$\dfrac{dy}{dx}=\dfrac{x}{y}.$
Work Step by Step
$\dfrac{d}{dx}(x^2)-\dfrac{d}{dx}(y^2)=\dfrac{d}{dx}(25)$\rightarrow
$2x-\dfrac{dy}{dx}(2y)=0\rightarrow$
$\dfrac{dy}{dx}=\dfrac{x}{y}.$
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