$0.2+10.2$
$2r\sqrt{r^2-4}\:.\sqrt{r^2-4}$
$\frac{\sin\left(x\right).\cos\left(x\right)^2}{\cos\left(x\right)}-\cot\left(x\right).\sin\left(x\right)^2$
$x^4+2x^3-3x^2-8x-4$
$2\:\tan\left(2x\right)+4\:\tan\:\left(4x\right)$
$4x^2-12x+198$
$\left(x+3\right)^2-\left(x-6\right)^2$
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