$\lim_{x\to0}\:x-\tan\left(x\right)$
$x^2+x+6$
$-33v+49v$
$5\cdot\left(-7\right)^4+30\left(-7\right)^3$
$2x^2-2y^2-2x\cdot y$
$\frac{1-\sin^2x}{\cot^2x}=\cos^2x$
$n3\:+512$
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