Identify the coefficient of $x^2$ in $3x^2+2x^3+3x+2$.

Identify the coefficient of $x^2$ in $3x^2+1$.

Identify the coefficient of $x^2$ in $2-5x^2+\frac{1}{2}{x}^3$.

Identify the coefficient of $x^2$ in $\frac{x^2}{2}+1$.

Identify the coefficient of $x^2$ in $x^4+x^3+\frac{1}{4}{x}^2$.