$-3x^6+47x^4+21x^2-80$
$e^xdx=e^{-y}dy$
$\frac{dy}{dx}=\sec^3\left(x\right)$
$-9x+2\ge11$
$\frac{x^4-2x^2+1}{x^3+2}$
$25y^2-9$
$\int-x^2sin\left(3x\right)dx$
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