$\frac{7x^2}{9}+\frac{8x^7}{6}$
$\tan\left(x\right)=-1.233$
$12c^{-7}d^6$
$3x^2-9x$
$\frac{cos10x-cos12x}{sin10x+sin12x}$
$\lim_{x\to\infty}\left(\sqrt{3x^2+6x+2}-\sqrt{3x^2+5x}\right)$
$2u\left(\frac{1}{x}\right)$
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