$2z^2-2z=1$
$\frac{\cot^2\left(x\right)-4}{\cot^2\left(x\right)-\cot\left(x\right)-6}$
$8tanx-\frac{8}{3}cotx=0$
$x^2-6x-8$
$6y^2+5y^2-6$
$a3\:+\:8$
$+4+4-10$
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