$2x+5=x+2$
$\lim_{x\to0}\left(\frac{arctan\left(3x\right)}{ln\left(x\right)}\right)$
$^{2^3}.^{2^2}$
$x\left(n-1\right)+3y\left(n-1\right)$
$\tan^2\left(x\right)\sec^2\left(x\right)-\tan^2\left(x\right)$
$\lim_{x\to3}\ln\left(x\right)$
$-12x-4=-2x^2$
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