Question: For the following equations, derive a conservation law. 1- 2 - ? 3- The modified KdV ? ? du + -Cosu =

For the following equations, derive a conservation law.

1- frac{partial u}{partial t}+ frac{partial^2 u}{partial x^2}+frac{partial u} {partial x} cos u=0

2 - ? ufrac{partial u}{partial t} + (frac{partial u}{partial x})u^2=0

3- The modified KdV ? ?atv-38x(v)+a, v=0

du + -Cosu =

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