$\sec x\left(\csc x+1\right)$
$-x^2+5x+6$
$\sqrt{\left[-2.\left(-7-1\right)\right]}+\left(-5\right)^2.7^0\:-\sqrt{4^2}$
$345.000\cdot0.0001$
$-x^3+9>0$
$\frac{1}{s\left(2s+1\right)}$
$x^2-30x+18$
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