$6+3\left(7-9+5\right)-6+7-8$
$\lim_{x\to1}\left(\frac{3\:lnx}{8\:sin\:x}\right)$
$sin^2ycos^2y$
$2.52\cdot3$
$\frac{3x-8}{2}=5$
$9b^2+60bc+100c^2$
$\sec\left(a\right)=-5$
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