$\frac{16}{2x}$
$243+3a^2$
$2x-3<-7+x$
$\frac{1}{\cos y}-\frac{cos\:y}{1+\sin y}=tan\:y$
$\left(x^2+1\right)\left(12x^2-2\right)$
$\int\:\frac{2x+1}{\left(x-2\right)\left(x+3\right)\:}dx$
$\frac{6}{s^4+5s^3+2s^2}$
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