$3.8\sqrt{3}$
$\csc\left(a\right)\left(\sec\left(a\right)-1\right)\left(\sec\left(a\right)+1\right)$
$-2^2+4\cdot2$
$3ab^2\sqrt{c};\:a=1;b=-2\:;\:c=\frac{1}{4}$
$\frac{\left(x^2+3x+2\right)}{4x-3}\ge-2$
$\int\sqrt{x}lxdx$
$2^7-1$
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