Simplifying an expression by regrouping terms
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Expanding a polynomial in one variable before using coeff
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Writing a multivariate polynomial in different forms
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Note this returns a result that is order-dependent
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But this does not
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Applying a function to the coefficients
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Collect understands positive and negative rational powers
Collect can simplify for general indeterminates (e.g. diff, D, sin).
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Collect does not sort in general
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