$\left(y^4-7\right)\left(x^4-11\right)$
$x'=2x+3e^t$
$8x^6-7x^3-1$
$2+-6^2$
$- 4 x + 3 \geq 0$
$\int sen\:\left(x+2\right)dv$
$r^2+9r+6+0r^{-1}\cdot r-3$
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