$x^2+8x-1=0$
$0.1\cdot2$
$\frac{9^4\cdot5^3\cdot9^2\cdot5^2}{5^4\cdot9^3}$
$\left(4x-1\right)-+39$
$-12.85-\:30.71$
$\sqrt{4\sec\left(x\right)^2+\tan\left(x\right)^4}$
$0<\frac{9x^2+12x+4}{4}$
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