$9x^2-6x+2$
$x^2\left(\frac{dy}{dx}\right)-y\sqrt{x}=0$
$\frac{1+x^{10}}{1+x}$
$1-2cos^2x=sin^4x-cos^4x$
$3y+y+2y^2-x^2$
$\frac { x ^ { 2 } - 16 } { x ^ { 2 } + 8 x + 16 }$
$x+2x$
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