$x^2=3x+40$
$\int-e^{-x}\cdot sinx\left(x\right)dx$
$y^'=\cos\left(x-y\right)$
$\left(\frac{1}{2}-k\right)^4$
$\left(x-2y\right)dx+2\left(y-x\right)dy=0$
$n^{2-4n+4}$
$-4x^2-9y^2$
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