$\frac{\sin\left(180+a\right)+\cos\left(180+a\right)+\cos\left(a\right)}{\sin\left(180-a\right)}$
$\frac{3x^2-10}{x}$
$8vu^3\cdot4u^2v^4$
$\int2^{x+4}dx$
$y'-2xy=xe^{x^2}$
$-1\left|-\left(38-54-7\right)\right|-\left(4+9\right)$
$\lim_{x\to2}\left(\frac{x-1}{x^2-3x+2}\right)$
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