$7abc=7a+7b+7c$
$\left(\left(2^2\right)\right)^4$
$2.\left\{-8\right\}-3.\left\{-7\right\}-4.\left\{+3\right\}$
$\frac{du}{dx}=e^u-e^{2u}$
$15\le x+2$
$m^2-10+25$
$\lim_{x\to0}\left(\frac{sen\left(a+h\right)-sena}{h}\right)$
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