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## Homework Statement

I have the equation -(ck^2)U(k,t)=d^2/dt U(k,t). And I need to find the general solution.

## Homework Equations

## The Attempt at a Solution

I can rearrange this into the form d^2 U/dt^2 + (ck^2)U(k,t)=0 but I am not sure of the form of the solution to this equation.

could someone please give me pointer in the right direction