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Question

The range of the function f(x)=sin[x],π4<x<π4 where [x] denotes the greatest integer x, is ____.

A
{0}
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B
{0,1}
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C
{0,±sin 1}
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D
{0,sin 1}
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Solution

The correct option is C {0,sin 1}
f(x)=sin[x], where π4<x<π4
We divide the range into two parts,
(a) π4<x<0
[x]=1
f(x)=sin(1)=sin1

(b) 0<x<π4
[x]=0
f(x)=sin0=0
Thus, the range of f(x) becomes {0,sin1}

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