$\lim_{x\to0}\left(\frac{sinx^4}{x^4}\right)$
$2x+2x+1$
$4-5x=x-32$
$\frac{a^3-3a^2-a+3}{a-2}$
$\frac{w}{w-5}=\frac{2w}{2w-3}$
$\left(\frac{x-4}{\sqrt{x}-2}\right)\left(\frac{\sqrt{x}+2}{\sqrt{x}+2}\right)$
$x=\ln\left(y-4\right)$
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