Question
Solve the differential equation : $y-x \frac{d y}{d x}=0$
$\begin{aligned} & y-x \frac{d y}{d x}=0 \\ & \therefore y=x \frac{d y}{d x} \\ & \therefore \frac{d x}{x}=\frac{d y}{y}\end{aligned}$
Integrating on both sides, we get
$\int \frac{d x}{x}=\int \frac{d y}{y}$
∴ log |x| = log |y| + log |c|
∴ log |x| = log |cy|
∴ x = cy
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$\int \cos (\sqrt[3]{x}) d x$