Question: Renaming constants

Not sure if it's the right place to ask this very simple question.

I have solved a DE and got x(t) = _C1*sin(sqrt(k)*t/sqrt(m)). Both _C1 and sqrt(k/m) are constants but I want to use different letters for them. I want _C1 to be renamed A and sqrt(k/m) to be renamed W. Can someone please suggest how I can do this ?

Thanks.

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