$\frac{1-\cos^2}{\sin\left(x\right)}$
$\left(2x^4y^7\right)^0\left(x^{-3}y^4\right)^5$
$\lim_{x\to\infty}\left(-3+e^{\left(-x+2\right)}\right)$
$x^2-64=0$
$20+107+116+99+45$
$cosa=\frac{1}{2}$
$\sqrt{8}0\:x^2y^8\:\:$
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