$\frac{2a^3}{b^{-1}}$
$\frac{16m^4-10000}{2m-10}$
$2\:sec\:x\:tg\:3x-2secx+tg\:3x-1=0$
$\left(-4+1\right)^2.\left(3-6\right)^3.\left(-1-2\right)$
$\int7x^2e^{2x+1}dx$
$\lim_{x\to0}\frac{ln\left(x+1\right)}{4^x-1}$
$12n-13n$
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