$\cos\left(\frac{4}{5}+\left(\frac{3\pi}{2}\right)\right)$
$\lim_{n\to\infty}\left(n\sin\left(\frac{6}{n}\right)\right)$
$\left(x^{a+1}+x^{2a-1}\right)^3$
$\left(6x^410^3-12x^2-6x+3\right)+\left(3x^4-2x^3-6x^2+6x-7\right)$
$a^3+18a+81$
$-20x\left(+10\right):\left(-5\right):\left(+8\right)$
$5x+2>x-6$
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