$-3n-10n-2n$
$4x-2=34$
$\frac{1}{2}\left(sin\left(a+b\right)-sin\left(a-b\right)\right)$
$\left(2x+3y\right)^2\:$
$\lim_{x\to4}\left(\frac{\sqrt{x-2}-\sqrt{2}}{\sqrt{x-1}-\sqrt{3}}\right)$
$1,25-2$
$f\left(x\right)=2x+2x^5+\sqrt{4}$
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