$- 9 \cdot ( - 2 : 18 )$
$\left(2m^3+3\right)^2$
$-5x-y$
$2a^2-4ab-5a+10b$
$\frac{seca}{cota+tana}$
$\sin\left(x\right).\cos^2\left(t\right)dx+\cos^2\left(x\right)dt=0$
$2\cdot164^2+3x-5x^3,x$
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