$-25-\left(-5\right)$
$\left(2x+1\right)\left(4y-3\right)$
$1+36-45-11-5$
$4a-5a$
$\frac{\frac{3.9}{3.9+1}-\frac{4}{5}}{3.9-4}$
$\tan^2\left(\frac{5\pi}{6}\right)-\sec^2\left(\frac{5\pi}{6}\right)=-1$
$f\left(x\right)=3\sqrt{x+4}-6$
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