$-2945-980$
$\frac{n^2}{n^2+1}$
$\frac{3}{4}\:=\:\frac{1}{4}\:x$
$15^2+6^2$
$-10+\left(9.3-6.5\right).6+\left(-15+6\right)$
$\frac{-\:sinx}{1-cosx}$
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