(math-trig-inverses, math-div-trig, math-div-non-trig): New variables.
(math-combine-prod-trig, math-div-new-trig, math-div-new-non-trig) (math-div-isolate-trig, math-div-isolate-trig-term): New functions. (math-combine-prod, math-div-symb-fancy): Add simplifications for trig expressions.
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