$\cot^2\left(x\right)=1$
$12x^2\ge50$
$\tan^2\left(x\right)-\frac{\sqrt{3}}{3}=0$
$\left[\left(n+2\right)\left(n-2\right)\left(n^2-4\right)\right]^3$
$769.56-384.765$
$a-9=15$
$9x+5y=69$
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