$x^2-x+4<0$
$\frac{dy}{dx}=x^2\left(4y-2\right)$
$\lim_{x\to6}\left(2y-11\right)^{\frac{1}{\left(y-6\right)}}$
$-1+\left(-7\right)+\left(-11\right)+\left(-5\right)+9$
$18x+4x\left(2x-4\right)=2\left(4x^{2}-x\right)+20$
$y'+\frac{y}{sec\left(x\right)}=sec^2\left(x\right)e^{-sen\left(x\right)}$
$\frac{-x^4+4x^2+2}{x-2}$
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