" The following functions are continuous on "(0,pi)

Which one of the following functions is not continuous on (0,pi)?

Which of the following functions are continuous at x=0? [Note: sgn x denotes signum function of x .]

Which of the following functions are decreasing on 0,(pi)/(2) ?

Which of the following functions are decreasing on 0,(pi)/(2) ?

Which of the following functions are decreasing on 0,(pi)/(2) ?

The following are continuous on (0, pi) :

For what value of k is the following function continuous at x=-(pi)/(6)?f(x)={(sqrt(3)sin x+cos x)/(x+(pi)/(6)), when x!=-(pi)/(6)k, whenx =(pi)/(6)

Which of the following functions is continuous at x = 0 ?