$3\left(2\right)^{x-2}=48$
$2\:x\:12$
$\ln x-\ln\left(x+1\right)=\ln\left(4\right)$
$\frac{tan^2\left(x\right)}{1-cos\left(x\right)}=\frac{1}{1+cos\left(x\right)}$
$\left|-3\right|+\left|5\right|$
$\frac{x^4-x^3+5x+2}{x^2+x-1}$
$\frac{\sqrt{x}}{x+\sqrt{x}}$
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