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SolveByGatheringACommonPolynomialFactorOfASum​(AngouriMath.​Entity,​AngouriMath.​Entity.​Variable,​System.​Boolean)

 Method (no overloads)

Summary

A sum every term of which carries the same power of one linear form in
x, written as that power times the sum of the rest:
x cosh(x)^(3/2) - x sqrt(cosh(x))/3 is x (cosh(x)^(3/2) - sqrt(cosh(x))/3),
which parts answers and the split does not -- neither term of that pair has an
elementary antiderivative, and only their combination has one.

Remarks

After SolveBySplittingSum(AngouriMath.Entity,AngouriMath.Entity.Variable,System.Boolean), which answers every sum whose terms are
each integrable and gives the shorter answer for them; this is for the sums it
declines. The same question, not one of its own: what is handed on is the integrand
rewritten, and the rules below it -- parts among them -- see the product.
https://github.com/asc-community/AngouriMath/issues/718

























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