$\int\frac{1}{\left(x+a\right)\left(x-a\right)}dx$
$|9|:|-3|$
$\sqrt{a+6}=b$
$\left(\tan+\cot\right)^2$
$0.2x^2\left(x^3-6x^2-1\right)$
$-270\sin\left(x\right)=0.25$
$x^2+60=16x$
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