If , where denotes the greatest integer less than or equal to , then is equal to
Explanation for the correct option.
Find the value of :
For it is seen that and so .
Thus, the function is a constant in the interval and the value of the constant is .
It is known that the derivative of a constant function is zero. So in the interval .
As lies in the interval so .
Thus the value of is .
Hence, the correct option is B.