$6\left(x^{2}-4x+1\right)$
$\frac{3-x^2}{x^2-5}$
$7x+12x^2+25x^2$
$\int\frac{x^2}{\left(16-x^2\right)^2}dx$
$2\left(3\right)+17$
$\frac{sec\:b}{2\:tan\:b}$
$6\left(x-5\right)=30$
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