$6n^2-20$
$6a^2-2a^2$
$3\:\left(b+2\right)^2$
$\lim_{x\to1}\left(\frac{5sin\left(\pi x\right)}{\ln\left(x^6\right)}\right)$
$\int\frac{3x^4-1}{3x^5-5x}dx$
$4\:\cot x+5=9$
$a\left(c+d\right)+\:b\left(a+b\right)+c\left(b+c\right)$
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