$\left(4x-x^4\right)$
$\lim_{x\to0}\left(\frac{e^x-\left(1-x\right)}{x}\right)$
$5a+4b^2y;\:a=3;\:b=2$
$sin4\left(x\right)+cos4\left(x\right)=1$
$z^2-2z-35$
$\log_{12}\left(x^3\right)$
$\left(bx+c\right)\left(x-2\right)$
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