$y^2-2\cdot3y^3-6y$
$\int\frac{3x+1}{x^2-1}dx$
$\int\frac{x^2+x-1}{x^3+1}dx$
$-2x-7+8x+3+z$
$-\frac{1}{4}a^{n-2}+\frac{1}{2}a^{n-2}$
$\frac{d^5y}{dx^5}=\left(x+1\right)\left(x+2\right)\left(x+3\right)\left(x+4\right)$
$4x^2-4x+7$
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