Which of the following functions have finite number of points of discontinuity in R ([.] represents the greatest integer function)?

Which of the following functions have finite number of points of disco

1.	Which of the following functions have finite number of points of discontinuity in R ([.] represents the greatest integer function)?
A.	\[\operatorname{tanx}\]
B.	\[x[x]\]
C.	\[\frac{\left\| x \right\|}{x}\]
D.	\[\sin [\pi x]\]
Answer» D. \[\sin [\pi x]\]

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Which of the following functions have finite number of points of discontinuity in R ([.] represents the greatest integer function)?

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