Pregunta: expression (cos(3x) + i sin(3x))/(cos(x) + sin(x))

To simplify the expression $\frac{\cos \left(3\mathrm{x}\right)+\mathrm{i}\sin \left(3\mathrm{x}\right)}{\cos \left(\mathrm{x}\right)+\sin \left(\mathrm{x}\right)},$

we can rationalize the denominator by multiplying the numerator and deno...