I have a symbolic function f = function('f')(x). Is there a way to assume it is real and get abs(exp(I*f)) = 1?

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I have a symbolic function f = function('f')(x). Is there a way to assume it is real and get abs(exp(I*f)) = 1?

I have a symbolic function f = function('f')(x). Is there a way to assume it is real and get abs(exp(I*f)) = 1?

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