Class 11 Book Solution from S N Dey in Relation and Function Question No: 2C.2.3(i)
মনে করো, \(f:R\rightarrow R\) অপেক্ষক নিম্নরূপে সংজ্ঞাত :
\(f(n) = \begin{cases} 1, \text{when}\ x \in Q\\ -1, \text{when}\ x \notin Q \end{cases}\)
f(2), \(f(\sqrt2)\), \(f(\pi)\), \(f(2.\dot{2}\dot{3})\), f(e) নির্ণয় করো ।
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