$16a^2-121$
$\left(7x+2\right)\frac{1}{2}$
$\frac{12x^2+32x+18}{2x+4}$
$x2-20x+100$
$10x^2+28xy$
$\int\frac{x^7}{42}dx$
$sin^2\theta\cdot cot^2\theta\:$
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