$\left(\frac{1}{4}x-7\right)^2$
$-3\left(-5\right)^2-3\left(-5\right)$
$25a^4+30a^2b+9b^2$
$3x-5<10$
$-9x^2+11x-6$
$\lim_{x\to0}\left(\frac{\sqrt{4+x}-2}{x^2}\right)$
$\frac{tan\:x-\:senx}{tanx}$
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