$3x-18\le2x-13$
$x^2+x-30>0$
$\left(5x^1y^{-3}\right)\left(4x^3y^{10}\right)$
$1+1+1+1+1-1-1-1-1+1+1+1-1+1$
$\cot2x=\frac{1+\cos4x}{\sin4x}$
$-6\left(4\right)\left(-9\right)$
$0,25+0,2+0,3+0,1+0,1+0,05$
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