What can we learn about the constants in the limit of k_3 for the E equation?

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The discussion focuses on the behavior of constants in the equation involving k_3 as the limit of \(\sqrt{x^2+y^2+z^2}\) approaches infinity. Specifically, the equation is expressed as \(k_3 \cdot (A_1 \cos k_1 x + A_2 \sin k_1 x) \cdot (B_1 \cos k_2 y + B_2 \sin k_2 y) \cdot (C_1 e^{k_3 z} - C_2 e^{-k_3 z}) = E\). It is concluded that for the expression to remain valid as \(\sqrt{x^2+y^2+z^2}\) approaches infinity, the constants must be selected such that the entire expression equals zero for all values of x when y and z are set to zero.

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Apteronotus
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Hi,

If
<br /> k_3 \cdot (A_1 \cos k_1 x + A_2 \sin k_1 x)\cdot(B_1 \cos k_2 y + B_2 \sin k_2 y)\cdot(C_1 e^{k_3 z}-C_2 e^{-k_3 z})=E<br />

in the limit as \sqrt{x^2+y^2+z^2}\rightarrow\infty

Can we infer anything about any of the constants?
 
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Apteronotus said:
in the limit as \sqrt{x^2+y^2+z^2}\rightarrow\infty

One way to let \sqrt{x^2 + y^2 + z^2} approach infinity is to set y = 0, z= 0 and let x approach infinity. Do you really mean to allow that kind of approach? if so, won't the constants have to be chosen so the the expression is identically zero for all values of x ?
 

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