$n+18=23$
$\sin\left(o\right)\sec\left(o\right):\:\tan\left(o\right)$
$\left(x^a-x^{a+1}+x^{a+2}\right)\left(x+1\right)$
$3x^1$
$40-\left(-3\right)$
$\frac{x^3}{x^{10}x^7}$
$-110+25-\left(-12\right)+13-4$
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