Final answer:
To find the coordinates of u in the ordered basis b, additional context such as basis vectors and representation of u is required. The solution could involve applying a transformation matrix if it's a mathematics question or using physics equations if it pertains to relativity.
Step-by-step explanation:
The student has asked for help finding the coordinates u in an ordered basis b. To provide a solution for this, we would usually need additional context, such as the basis vectors of b and how the vector u is represented in a standard basis. However, based on the snippets of solutions provided, this appears to be related to either a physics context involving relativity (since c is mentioned, commonly denoting the speed of light), or to an integration problem where the variables are dummy variables of integration.
Without the proper context or full information about the known variables or the mathematical system in question, it is impossible to provide a definitive answer. Generally, one would use the provided equations and the known values to solve for u by either applying a transformation matrix, if we're dealing with linear algebra, or by using appropriate physics equations if we're dealing with relativity.
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