I am trying to figure out how to write a WW problem that asks to combine like termsĀ for a trig polynomial:

Any help would be great!

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Isn't it that you just want to replace different powers of x with different trig functions?

23.b is the same as 23.a but x^2 replaced with cosine square and x replaced with cosine.

I would use the problems in Rochester/setAlgebra03Expressions as a starting point.

You could use cotnextForm.pl, which relies on bizzarroArithmetic.pl:

https://github.com/Alex-Jordan/webwork-open-problem-library/blob/master/OpenProblemLibrary/macros/PCC/contextForm.pl