$\cos\left(30\right)^2$
$|-4\:+\:5|$
$-5^2-1$
$12b-15b+8b-9a+4a$
$x\cdot\:\:x+x^2+6$
$\left(2j^2k^4\right)^{-2}\left(k^{-1}j^7\right)^6$
$\int\left(x^2\left(2+x^3\right)^5\right)dx$
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