A) \[1+x\]
B) \[1/x\]
C) \[x\]
D) \[-x\]
Correct Answer: D
Solution :
[d] \[3f(x)-f\left( \frac{1}{x} \right)=\log {{x}^{4}};\,\,\,\,x\equiv \frac{1}{x}\] \[3+\left( \frac{1}{x} \right)-f(x)=log{{\left( \frac{1}{x} \right)}^{4}}\] After solving we get \[f(x)=log\,\,x\] \[f({{e}^{-x}})=lo{{g}_{e}}{{e}^{-x}}=-x\]You need to login to perform this action.
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