$x^2+22x+120$
$2\:\lim_{x\to0}\left(sin\frac{7}{x}\right)$
$\log\left(5x\:+\:3\right)=\:\log\left(2x-1\right)$
$\frac{1-\sec\:^2\left(x\right)}{\tan\:\left(x\right)-\tan\:\left(x\right)\sec\:\left(x\right)}\:$
$2\left(5-8f\right)$
$-x^2+16x+20$
$\lim_{x\to0}\left(\frac{e^x-1}{x^2}\right)$
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