$2,5\:.\:4$
$\left(2x-3z^2\right)^2$
$-4+4i\sqrt{3}$
$1-\frac{\cos^2a}{1+\text{sina}}=\text{sina}$
$3v^3\left(3v^3\right)$
$\left(5x^4-6y^4\right)^3$
$\frac{2x^2-x-7}{x+1}$
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