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  Write each polynomial as a vector with respect to the basis B
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  Create a matrix that is made up of the vectors obtained in step 1 and reduce to RREF
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  If the reduced matrix is the identity matrix, then the set S is a basis for Pn
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  Create augmented matrix with previous matrix and p(x)
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  Reduce to find C1 - Cn
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  Express p(x) as a vector in terms of the Basis S based on the results of C