$\left(2x^4\right)x^2+8x+15$
$2,5+0,5$
$-19+12y+15k-3y-5k+3$
$6x+1-3x-1$
$x^3-8x^2$
$\cos\left(y\right)\frac{dy}{dt}=\frac{-t\sin\left(y\right)}{1+t^2}$
$\int\frac{7z^{2}}{z^{3}-4}dz$
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