The expression cos(x)−cos(3x)sin(3x)−sin(x)\frac{\cos(x) - \cos(3x)}{\sin(3x) - \sin(x)}sin(3x)−sin(x)cos(x)−cos(3x) simplifies to which of the following?
tan(2x)\tan(2x)tan(2x)
cot(2x)\cot(2x)cot(2x)
tan(x)\tan(x)tan(x)
cot(x)\cot(x)cot(x)