$3cos^2\left(\theta\right)$
$x+11\le8$
$\left(3-\:\sqrt{x+1}\right)^2$
$\left(a^2-3\right)\left(a^2+4\right)$
$\frac{x^2-81}{x+9}$
$\left(2a+b+2\right)^3$
$\frac{x+1}{2x-1}=\frac{3}{4x-1}$
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