$\left(x-4\right)\left(x+5\right)\left(x+4\right)\left(x-5\right)$
$\sec\left(-x\right)+\sin\left(\pi-x\right)$
$4\cdot\left(-6\right)+\left(-3\right)\cdot5$
$-36:-2$
$2y^4-y^3+4y-2$
$-3x>14$
$\lim_{x\to\infty}\left(\frac{x^2}{1+x^2}\right)$
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