$\left(x^2+6x+9\right)\left(x^2-4x+4\right)$
$1+\left(x+1\right)\cdot\left(x-1\right)$
$6x^2+xyt-2y^2-x+11-15$
$\:x^2+16x+64=0$
$\left(m-4n^2\right)^2$
$\left(\frac{1}{3}a-\frac{1}{5}b\right)\left(\frac{1}{9}a^2+\frac{1}{15}ab+\frac{1}{25}b^2\right)$
$\int_0^1\frac{e^x}{x}dx$
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