$5tan^2\left(x\right)+5tan\left(x\right)-60=0$
$\lim_{x\to4}\left(x^2-16\right)$
$\sqrt{2x+1}=3$
$11x^2-4x=1$
$\left(2a+4\right)\left(2a+4\right)$
$2x^2+\left(4x-6x^2\right)+9-\left(6x+3x\right)$
$\lim_{x\to6}\left(\frac{sqrt\left(x+10\right)+4}{x-6}\right)$
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