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Question: use the general quotpartialquot variables quotsee belowquot on the equation...

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Use the general "partial" variables, "see below" on the equation 9 (I have asked this question in another post, I am not sure if someone answered) and show that we can obtain an equation only for the spacial part, with the form : "see below"  

14. Use a solução geral com separação de variáveis, Ψ(x,t) ψ(x)f(t) na equação do exercício 9 mostre que podemos obter uma eq

question 9:

Translation:

The equation is uni-dimensional wave: "See below"
where U=U(x,t) is the wave equation, show that u(x,t) = Acos(wt)sin(kx) is a solution of the equation.

9. A equação de uma onda clássica, unidimensional, é 1au em que u u(x, t) é a equação da onda, como função da posição e do te

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