$\lim_{x\to0}\left(\frac{sin\left(4x\right)}{tan\left(x\right)}\right)$
$y'+y=xe^x$
$3x^2-2x-7$
$\frac{27}{\sqrt{27}}$
$1-\left(\frac{1}{sec^2\left(x\right)}\right)=sin^2\left(x\right)$
$x+3x-10$
$\frac{4-x^2}{x+1}$
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