$ctgx.secx$
$f\left(x\right)=\left(x+3\right)^2$
$x^2-6=x$
$4b+6+b-2$
$\left|-\left(-5\right)\cdot3+5\right|$
$\frac{8\cdot10^{-4}}{2\cdot10^{-6}}$
$10x^2-13x-3$
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