$\frac{d}{dx}4x^2tan\:\sqrt{x}$
$\left(x^{2t}-2x^{-t}\right)^3$
$-2x\left(2x^5+3x^4-x^3+2\right)$
$3m^2-mn+6mn-2n^2$
$\frac{\left(4^4\right)^2}{4^4}$
$\left(20-x^4\right)^2$
$\frac{x^{-4}x^2}{x^2}$
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