$\sec^2\left(45\right)$
$y'+y+1=0$
$x^2+y^2=32$
$30x+3x-26x+3x-x$
$\sqrt{48.5}$
$\frac{x^2-6xy+9y^2}{2x^2-6xy}$
$\frac{\frac{p-6}{2}-\frac{5}{2}}{\frac{p-6}{r}-\frac{5}{p-6}}$
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