$8c+12-3a+5-3b^2+2c+5a$
$2+\log_a\left(1+\frac{2b}{a}+\frac{b^2}{a^2}\right)$
$r^2+9r+6+0r^{-1}\cdot r-3$
$\left(m+3\right)=12-2m$
$\frac{1}{\cot^2\left(x\right)}+\sec\left(x\right)+\cos\left(x\right)$
$\frac{8}{1-cos2x}$
$\lim_{x\to0}\left(\frac{2\sin\left(x\right)-\sin\left(2x\right)}{x^2\tan\left(3x\right)}\right)$
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