$\frac{d^4}{dx^4}\left(4x^2-e^x\right)$
$w=\tan2$
$a^4\cdot2ba^4$
$\frac{x^3-x^2+4}{-x^3-x+1}$
$\int\left(\frac{2}{x^3\sqrt{x^4-49}}\right)dx$
$\left(3l-m\right)\left(6i+4\right)$
$3+2\cdot5-7\cdot\left(3+5\right)$
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