$\frac{x^2+2x\:-3}{x^2+1}$
$\tan^2+3=0$
$\frac{\sqrt{144}}{\sqrt{9}}-\frac{\sqrt{100}}{\sqrt{25}}$
$\frac{cos\left(2x\right)+sin\left(2x\right)-1}{cos\left(2x\right)-sin\left(2x\right)+1}=tan\left(x\right)$
$\lim_{x\to0}\left(\frac{x^4}{e^{3x}}\right)$
$\int2e^{2-7x}dx$
$x+5=13$
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