A) x is a real number
B) x is a rational number
C) x is an irrational number
D) x is a non-zero real number
Correct Answer: D
Solution :
[d] \[D(f)=R,D(g)=R-\{0\}\] \[\therefore D(h)=R-\{0\}\] and \[h(x)=f(x)g(x)=x\times \frac{1}{x}=1\] \[\therefore h(x)=1\] if and only if \[x\in R-\{0\}\]
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