$x-3\le0$
$x^2+y^2-2x+4y\le0$
$\frac{sinx}{\left(1-sin^2x\right)}$
$\left(8x+2\right)\left(8x+3\right)$
$2x-5+3a-5x+10a$
$f\left(x\right)=\sqrt{5x}$
$-5x-2y=36$
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