A) \[\left( \frac{1}{4},\ \frac{1}{3} \right)\]
B) [?1, 0]
C) [0, 1]
D) [?1, 1]
Correct Answer: A
Solution :
Clearly \[-1\le \frac{1}{1+{{e}^{x}}}\le 1\] But \[2<{{e}^{x}}<3\] Þ \[3<({{e}^{x}}+1)<4\]Þ \[\frac{1}{4}<\frac{1}{1+{{e}^{x}}}<\frac{1}{3}\] \Domain of \[f(x)=\left( \frac{1}{4},\,\frac{1}{3} \right)\].You need to login to perform this action.
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