$\left(8-2i\right)\left(8-2i\right)$
$\frac{d}{dx}\:t^2\tan h\frac{1}{t}$
$100x^4y^8-81x^2y^4$
$\frac{2x}{x-3}=4$
$0.125\cdot1000$
$x+4>12$
$25x^2+10x\left(y^2+5\right)+\left(y^2+5\right)^2$
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