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One dimensional wave equation is
$$\frac{\partial^2 y}{\partial t^2} = \propto^2 \frac{\partial^2 y}{\partial x^2}$$
$$\frac{\partial y}{\partial t} = \propto^2 \frac{\partial^2 y}{\partial x^2}$$
$$\frac{\partial^2 y}{\partial t^2} + \frac{\partial^2 y}{\partial x^2} = 0$$
none of these
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