$\frac{d}{dx}s=\:arc\:cos\:\frac{t}{2}$
$7+x\le9$
$\lim_{x\to\infty}\left(1-\ln\left(x\right)\right)$
$-4\cdot4+9$
$\sec a\left(\sec a-\cos a\right)-\tan^2a=0$
$9+4a^2-12a$
$63m^2-21m^3n+49m^2n^3$
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