$k^4-6k^2-16$
$-\left(15-16-9+8\right)$
$\frac{dy}{dx}\left(\sqrt{x}+\sqrt{y}=2\right)$
$( 3 x ^ { 2 } + 2 x ) ( 2 x - 2 )$
$\left(-12\right).7-13.\left(-5\right)$
$+\left(4x^3+5x^2-8x+15\right)\left(2x^3-3x^2-6x-10\right)$
$\left(5+a\right)\left(5-a\right)$
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