Which of the following is equivalent to 1−cos(x)sin(x)\frac{1-\cos(x)}{\sin(x)}sin(x)1−cos(x)?
tan(x/2)\tan(x/2)tan(x/2)
cot(x/2)\cot(x/2)cot(x/2)
sin(x/2)\sin(x/2)sin(x/2)
cos(x/2)\cos(x/2)cos(x/2)