beginaligned text once you have found solutions for xx text and tt tex
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\begin{aligned} &\text { Once you have found solutions for } X(x) \text { and } T(t), \text { what do you do to find a solution for }\\ &u(x, t)
? \end{aligned} O Apply the principle of linear superposition O Nothing. You are done. O Add them together O Divide them O Multiply them before differentiating using the product rule