$8x+y+z+u+-3x-4y-2z+3u+4x+5y+3z-4u$
$\left(b+2c+d\right)^2$
$\left(2a-3b+a^2\right)^2$
$\pi\int_0^1\left(xe^x\right)dx$
$x-21=6$
$\lim_{u\to\frac{\pi}{4}}\left(\frac{tan\:u\:-\:cot\:u\:}{u-\frac{\pi}{4}}\right)$
$\left(12a^4b^8\right)^0$
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