Which of the following expressions is equivalent to sin(3x)sinx−cos(3x)cosx\frac{\sin(3x)}{\sin x} - \frac{\cos(3x)}{\cos x}sinxsin(3x)−cosxcos(3x)?
222
4cos(2x)4\cos(2x)4cos(2x)
−2-2−2
2tan(2x)2\tan(2x)2tan(2x)