$\left(6x-2y\right).\left(6x+2y\right)$
$\frac{5x^2+20x+16}{x+3}$
$4x^4-20x^2\:z+25z^2$
$\int_2^6\left(2x-3\right)\left(x^2+3x+5\right)dx$
$uv\:-\:\:3u\:+\:3v\:-\:6\::\:uv\:-\:3v-\:3u\:+\:15$
$\lim_{x\to3}\left(\frac{x^3-9x}{x^2+3x}\right)$
$\frac{dy}{dx}-ycotx=2xsenx$
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