The composite mapping $fog$ of the maps $f:R \to R$,$f(x) = \sin x$,and $g:R \to R$,$g(x) = x^2$ is:
- A$\sin x + x^2$
- B$(\sin x)^2$
- C$\sin(x^2)$
- D$\frac{\sin x}{x^2}$
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