$-2\left(-2\right)^2+4\left(-2\right)-2$
$\left(\frac{1}{y-x}\right)y$
$-5r\:\:+\:2r$
$v-15=-27$
$\frac{x^2}{1+x^4}$
$\lim_{x\to\pi}\left(\frac{\left(x-\pi\right)\cos\left(\frac{3\pi}{2}-x\right)}{\sec\left(x-\pi\right)-1}\right)$
$\left(+4-19\right)-13$
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