$\lim_{x\to0}\left(5secx-5tanx\right)$
$\lim_{x\to1}\left(\frac{x^4+2x^3+x^2}{x+1}\right)$
$\left(-3\cdot7\right)+\frac{10}{5}-\left(18-7\right)$
$-500\cdot27$
$12.005+9.72+12.345+126.12$
$\left(-3\right)\cdot\left|-\left(+4\right)+\left(-7\right)-\left(-6+5-2\right)\right|$
$a^4+a^3-a^2-a$
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