$\left(y^9+3\right)\left(y^9-13\right)$
$x^2+15x+26$
$\frac{d^2}{dx^2}\ln\:\left(\frac{\left(2x+5\right)\left(5x-2\right)}{\left(x+1\right)}\right)$
$cos^4x-sin^4x=1-2sin^2x$
$x^2+7x-6=0$
$\sqrt{x=8x}$
$x^2+14x-15$
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