$2^3\cdot3^4.2^{-1}.3^{-1}$
$-14-25+7+23-\left(-18\right)+7+\left(-14\right)$
$15\tan^2a+14\tan a-8$
$\frac{a^{m}}{a^{n}}=a^{m-n}$
$\frac{\tan\:\theta\:}{\csc\:\theta\:\sec\:\theta\:}$
$\int sen^3\:4x\:dx$
$\left(e^3+1\right)^2e^{-2}dx+\left(e^2+1\right)^3e^{-3}dy$
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