Which pairs of function is identical?

1.	Which pairs of function is identical?
A.	\[f(x)=\sqrt{{{x}^{2}}},\] \[g(x)=x\]
B.	\[f(x)={{\sin }^{2}}x+{{\cos }^{2}}x;\,g(x)=1\]
C.	\[f(x)=\frac{x}{x},\,\,g(x)=1\]
D.	None of these
Answer» C. \[f(x)=\frac{x}{x},\,\,g(x)=1\]

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Which pairs of function is identical?

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