Functions $f,g:R \rightarrow R$ are defined,respectively,by $f(x)=x^2+3x+1,g(x)=2x-3,$ find $$(i)\quad f\; o\; g\qquad(ii)\quad g\;o\;f\qquad(iii)\quad f\;o\;f\qquad(iv)\quad g\;o\;g$$

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