$\int x^4\left(x^5+25\right)^8dx$
$\lim_{x\to-1}\left(\frac{5x^4+3x^3+3x+1}{x+1}\right)$
$\left(3i+j-k\right)\left(2i+3j-4k\right)$
$\left(a+12\right)\left(a+11\right)$
$2a^2+7y\left(2a^2-8y^2\right)$
$5ab-15bc$
$\left(6+5a\right)^2\left(6-5a\right)^2$
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