$\frac{2-x}{x^4}-\frac{1}{x^3}$
$\frac{\sin2x+\sin6x}{\cos2x+\cos6x}=\tan\left(4x\right)$
$3\cdot22$
$\int e^{x-2}dx$
$9m+12$
$\left(15m^2n^3+5n^3\right)$
$\sqrt { 121 }$
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