$\lim_{x\to\infty}\left(\frac{\cos\left(x\right)-1}{x}\right)$
$\left(a^2+3a-z\right)^2$
$4v^2+36v+81$
$2x-1+2x^2+5x-3$
$2y^2+y-1$
$5^{1-x}=5y$
$10.20\cdot0$
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