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Let  f(x)=[n+psinx], x belongs to(0,π), n belongs to Z, p is a prime number and [x] is a greatest integer less than or equal to x.The number of ponts at which f(x) is not differential is



c. 2p+1

d. 2p-1

7 years ago


Answers : (2)



for X belongs to [0,pi] sin x lies in [0,1]

[sinx] is discontinuous at pi/2 , so not differentiable at it

and now considering [n + sin x] where sin x is just shifted by n units along Y axes , but still the values lie in ( n , n+1) and here too the curve will be discontinues/not differentiable at 1 point i.e., at pi/2

now taking p( a prime no.) into consideration,

for p=1 , we have [sinx] with 1 discontinues/not differentiable points

for p=2 , we have [2.sinx] with 3 discontinues/not differentiable points

for p=3 , we have [3.sinx] with 5 discontinues/not differentiable points



for p = p ,it follows to (2p-1) discontinues/not differentiable points

option is D

7 years ago

[n +  p sin x] = n + [p sin x].

The points of discontinuity and hence of non-differentiability are the points where p sin x is an integer. There are no other points of non-differentiability.


So, the points of discontinuity are when sin x = 1/p or 2/p,..., (p-1)/p each of which have two corresponding values of x and sin x = 1, which has a unique solution in the given interval.


That makes 2(p-1)+1 = 2p-1 solutions


7 years ago

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