$\frac{4.2^6}{4.2^5}$
$-6\left(-x^2+3x-1\right)$
$\lim_{x\to5}\left(\frac{lnx}{x^2}\right)$
$x^4-20x^2+64$
$\frac{d}{dx}y^3-3y+2x=0$
$2x\:+1+7$
$\frac{1-tan\left(x\right)}{cot\left(x\right)-1}=\tan\left(x\right)$
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