$x^2+2x-18$
$-10-\left(9+4-0\right)+\left(-2+5-6\right)-\left(-17\right)$
$\lim_{x\to2}\left(\frac{x^2-4}{x^2-x+2}\right)$
$\left(-24\right):3+1+6:\left(-2\right)-1$
$sinxcos2x$
$\sqrt{3^{-3}}$
$\left(\sin^3\left(a\right)-1+\sin\left(a\right)\cos^2\left(a\right)\right)\left(1+\sin\left(a\right)\right)$
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