$\frac{\left(3\cdot2^x\right)}{2^{\left(x-2\right)}}$
$\frac{\left(\infty\right)^{\frac{1}{2}}}{\infty}$
$4x^2-4x+63$
$12y^2+5y-2$
$3-8\cdot8+10$
$\lim_{x\to3}\frac{\sqrt{x}-3}{x^2-9}$
$\int\frac{4x^2}{\sqrt{x^2+1}}dx$
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