$\lim_{x\to\pi}\cos3x$
$\sqrt[3]{2401b^5}c$
$x^{2+21-10=0}$
$5x^3-4x^2+2x-3-3x^2+2x^2+x-1$
$\left(nx\:+\:m\right)\left(nx\:-\:m\right)$
$-4\sin^2\left(x\right)+\sin\left(x\right)$
$\left(7g+2d\right)\left(7g-2d\right)$
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