$x^2+9+49$
$\frac{x^2+3}{x^3-2x^2+2x}$
$\frac{-4x^3+10x^2\:-5x\:+\:2}{x-2}$
$sin\left(b\right)\:sin\left(a\:+\:b\right)\:+\:cos\left(b\right)\:cos\left(a\:+\:b\right)\:=\:cos\left(a\right)$
$\lim_{x\to2}\left(\frac{\left(y^2+5y+6\right)}{y+2}\right)$
$\left(abc-1\right)\left(abc+1\right)$
$\int7\left(7x+28\right)^5dx$
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