$x^3-4x^2-5x.\:$
$\lim_{x\to\pi}\left(x\csc3x\right)$
$\left(x+y-1\right)\left(x^2+2xy+y^2+x+y+1\right)$
$\frac{\frac{1}{\sin\left(u\right)}}{-u-\frac{1}{\sin\left(u^2\right)}}$
$-67-\left(-98-12\right)$
$\cos^{-1}0.832$
$\left|-0.75-0.25\right|$
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