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**Home Assignment 1 / Re: Problem 5**

« **on:**September 23, 2012, 04:07:02 AM »

I will expand this question a little bit:Yes, you are allowed to use every appropriate (relevant) formula given in the class without rederiving it (unless specifically asked to derive it first). Definitely you need to ask yourself: "can I apply a formula for a general solution?", "Can I apply D'Alembert formula?"

So, can we use the formula of general solution for wave equation or we should prove/derive it?

There is a subtle difference between

*allowed*and

*can*: you

*can*use any appropriate formula but it may happen that you are

*explicitly*asked to use some specific approach in which case you

*are allowed*to use only some specific formulae.

Quote

P.S. This is my first post here, so I am not sure if I am asking an appropriate questionYes, it is a completely appropriate question.