$\left(\frac{-1}{x}\right)\left(\frac{-2}{x^3}\right)$
$\frac{dy}{dx}=\left(1+y^2\right)tanx$
$\frac { 3 x ^ { 4 } - 5 x ^ { 2 } + 2 } { 3 + x ^ { 3 } }$
$x^2+17x+70=0$
$\frac{6x^337x^2+3x-4}{3x^2+5x+4}$
$-12\cdot\frac{3}{4}$
$4+80y+400y^2$
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