$\lim_{x\to\infty}\left(\sqrt[2]{x^3+x^6}-x^6-x^4\right)$
$18\cdot18^5$
$6\cos^{2}\theta-7\sin x-1=0$
$\sqrt{x^2-36}=8$
$-2x^2\left(2x+3\right)$
$\left(6x+2m\right)^2$
$6x-5=4x+15$
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