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## Homework Statement

I must use the wave equation to to find the speed of a wave.

y(x,t) = (3.0mm) sin [(4.00mm^-1)x - (7.00 s^-1)t]

## Homework Equations

Here's the wave equation. It has strange symbols.

(∂^2 y) / (∂ x^2) = (1 / v^2) ((∂^2 y)/ (∂^2 t)

## The Attempt at a Solution

There's no way that I can attempt this solution if I don't know how to use this formula.

Do I just take the derivative.

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