$\frac{d}{dx}\:\frac{x^5}{x^2}$
$\frac{\left(sin2x-2sin2xsin^2x\right)}{1-sin^2x}$
$16x^2-8x-3=0$
$4y^8+140y^4z^4+100z^8$
$6x+5-3x-1$
$121-22x+x^2>0$
$2^42^2$
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