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FunctionPeriod is certainly imperfect. There is already discussion of this in this question, though that predates FunctionPeriod and uses lower level tools buried in the Periodic context. Nonetheless, the same comments apply: FunctionPeriod[Sin[3 t] Sin[5 t], t] (* Incorrect result: 2Pi *) FunctionPeriod[TrigFactor[Sin[3 t] Sin[5 t]], t] (* Correct ...



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