$5x-12y+8x+2x^2+4x^2$
$\left(2\sqrt{t}-t-\frac{9}{t^2}\right)$
$\int sen\left(2\right)\cdot\cos\left(4x\right)dx$
$\frac{dy}{dx}=-5e^{x-y}$
$\left(yc-xb\right)^2$
$4\left(x+5\right)-2x+3f$
$\left(3x-9\right)\cdot\left(x-3\right)$
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