$2.4\:x\:4$
$5x-\frac{1}{3}<\frac{1}{2}$
$15\cos x+1=0$
$\frac{4x+11}{\left(x-4\right)}\le\:1$
$1.3x-x$
$\int2\left(2x+1\right)^9dx$
$\frac{1}{\cos\:\left(\frac{3\pi\:}{2}-\arccos\:\left(\frac{-2}{3}\right)+\arctan\:\left(\frac{1}{7}\right)\right)}$
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