$-8+7-\left(3+4-9\right)$
$n^2-n-12$
$0.25\left(6x+1\right)=1.5x+0.25$
$4\cdot\cos^2\left(x\right)+9\cdot\sin^2\left(x\right)=1$
$4x^2-2x-12$
$xy'-2y=x^3e^x$
$\lim_{x\to0}\left(\frac{x}{2x+1}\right)^{\frac{1}{\left(x-1\right)}}$
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