$\frac{x^2+2x+4}{-4x^2-20x-16}$
$68-\left(21-52\right)+\left(7-72\right)$
$\frac{9x-4}{5}=\frac{7x+3}{10}$
$\csc+\cot\cos=\sin$
$\lim_{x\to\infty}\left(2^{1-x}\cdot x\right)$
$y^2-2y-15$
$\left(x^{2}+\sqrt{3}\right)\cdot\left(x^{2}-\sqrt{3}\right)$
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