$\frac{4x^2-x+1}{4+4x^3}$

$\frac{27x^6+1}{3x^2+1}\:\:\:\:\:\:$

$\left(2x\right)\left(2x\right)$

$\lim_{x\to\infty}\left(\frac{\frac{2^x+1}{2^x}}{\frac{2^x}{2^x}}\right)^{\lim_{x\to\infty\:}\left(2^x+1\right)}$

$\left(3\right)-\left(-9\right)$

$0.75\:\:\frac{3}{5}$

$\lim\:_{x\to\:\infty\:\:}\left(\frac{4x^3+5x^2-3x+2}{2x^2-3x+1}\right)$