Which trigonometric function has vertical asymptotes at x=π2+πkx = \frac{\pi}{2} + \pi kx=2π+πk for integer kkk?
cot(x)\cot(x)cot(x)
sin(x)\sin(x)sin(x)
cos(x)\cos(x)cos(x)
tan(x)\tan(x)tan(x)