$x+12=20$
$x^2\:\frac{1}{4}x+k$
$\int\frac{3x-1}{x^2+4x-5}dx$
$\lim_{x\to0}\left(\frac{4tan4\left(x\right)}{x}\right)$
$x\left(x^{-1}\right)$
$\:\:\frac{\left(a+b\right)^23a^2b^2}{4a^2b^2\:}\:\:$
$\lim_{x\to0}\left(-ln\left(cos\right)\right)$
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