$\left(x+2\right)\left(5x-1\right)$
$\lim_{x\to\infty}\left(\frac{cos9x-1}{x^2}\right)$
$u\cdot u$
$\left(-3\right)\cdot25+\left(-3\right)\cdot\left(-17\right)$
$2\left(-1\right)^{2}-3\left(-1\right)+4$
$\left(10x^6-9y^5\right)^2$
$-\left(9-4+5\right)-\left(-3+11\right)$
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