$\int\frac{sec\left(x\right)tan\left(x\right)}{2}dx$
$b\cdot5+1.5b\cdot2+3b$
$\left(m-1\right)\left(m-20\right)$
$4xy^4.4xy^{-4}$
$-\left(-5\right)^2\:+\:-\left(-3\right)^3$
$\left(x^2y^{-5}z^3\right)^{-1}$
$\left(3a^3-3b^2\right)\left(3a^3+3b^2\right)$
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