$\frac{4}{8\:\frac{1}{2}}$

$\sqrt[2]{\left(3^2+3\right):\left(-3\right)-2^2.\left(-5\right)}-\left(-6+2^3\right).\left(-5\right)^2-7^0$

$-12+6\cdot\left(-3\right)+\left(-5\right)$

$-3x^2:x$

$121x^61-108x^3+4$

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