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FilledSmallSquareExpToTrig[expr] converts exponentials in expr to trigonometric functions.

FilledSmallSquareExpToTrig generates both circular and hyperbolic functions.

FilledSmallSquareExpToTrig tries when possible to give results that do not involve explicit complex numbers.

FilledSmallSquare See The Mathematica Book: Section 1.4.5 and Section 3.3.7.

FilledSmallSquare See also: TrigToExp, TrigReduce, ComplexExpand.

Further Examples