$d^2+10d^2-10d^2+d^2$
$cos3x+cosx$
$\left(4x^2y^3-6\right)^3$
$72a+36ay-27az$
$\left(\frac{15x^3y}{4}\right)\left(\frac{8xy^2}{5}\right)$
$\lim_{x\to\infty}\left(2+\frac{1}{x}\right)^{-2x}$
$\cos\frac{x^3-8}{x-2}$
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