$4\cdot12d$
$x^2+10xy+100x^2$
$a^2-2a=15$
$-27-45-32-28$
$22x-12y+3y-7x$
$\left(\sin a-\cos^2a\right)^3$
$\sqrt{\frac{6}{x}}\cdot\sqrt{\frac{x^{2}}{24}}$
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