$3x+8\le x+20$
$\left(r+8\right)\left(r+5\right)$
$\left(w+1\right)\left(w+2\right)$
$\frac{3x^2+6x+3}{5x^2+5x}$
$2^6\cdot3^3$
$\frac{\sin\left(w\right)}{\cos\left(w\right)}-\frac{\cos\left(w\right)}{\sin\left(w\right)}$
$\frac{\left(sinx\:-cosx\right)^2}{1+2sinxcosx}$
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