$2x^2y+3xy$
$\lim_{x\to-1}\left(\frac{3x^2+5x+12}{x-1}\right)$
$7x^2+xy$
$\left|\frac{2^4}{2^6}.\frac{2^{-8}}{2^7}\right|^{-4}\left(\frac{2^6}{2^{-3}}\right)^{-2}$
$f\:\left(x\right)=\:\frac{1}{3}x\:\frac{3}{7}-x\frac{1}{3}x\frac{1}{2}$
$\frac{\sin\left(a\right)}{\cos\left(b\right)}+\frac{\cos\left(a\right)}{\sin\left(b\right)}=\frac{2cos\left(a-b\right)}{sin\:2b}$
$\left(10^0\right)^3$
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