$9\left(6+2y\right)-5+2y$
$x^2-12x+6$
$x^2+1x+49$
$28-\left(-5\right)$
$\frac{1}{x^2\left(2x+1\right)}$
$\left(\tan\left(a\right)+\tan\left(b\right)\right)\left(1-\cot\left(a\right)\cot\left(b\right)\right)$
$24a-36b$
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