$\tan a=\sin a\cdot\sec a$
$1\:+\:tan\left(u\right)\:tan\left(v\right)$
$\left(81r\right)^{\frac{1}{4}}$
$3a-6a^2$
$x^5-12x^4-9x^3-48x^2-52x$
$\log\left(2x-8\right)+\log\left(x+1\right)$
$-4x-20x-9$
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