$8^4\cdot8^{-2}$
$14y^3z^5-28y^3z^6-9xy^2z^2$
$3tan3x=3$
$\lim_{x\to0}\left(\frac{x^2}{1-3cos^2x}\right)$
$2k-k$
$25+-3^2-5$
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