$2t^2+1+4t$
$\lim_{x\to0}\left(\frac{1-cos^2\left(4x\right)}{1-cos\left(2x\right)}\right)$
$6\sin\left(\frac{36}{7}x\right)$
$x^2-3x-81$
$7x+12=x$
$49+-16+-41+15+28+-36$
$-10x+7x+24-2x$
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