$\sqrt{\frac{5}{3}}\cdot\sqrt{\frac{27}{5}}$
$2x+10=800$
$-\frac{72}{4}$
$-10-\left(-7\right)$
$\sqrt{x-1}\cdot\sqrt{x+1}$
$\cos\left(x\right)\cdot\csc\left(x\right)\cdot\left(\sec^2\left(x\right)-1\right)$
$x^2+5x+49$
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