$\frac{2k^3k^3}{k^{-3}}$
$\lim_{x\to1}\left(\frac{3-3x}{2-\sqrt{x+3}}\right)$
$\frac{4^4}{4^3}$
$-4-5+1-1$
$x^2+24x+36$
$\frac{3}{5}x^2+3x=-1$
$1+cos\left(x\right)\left(1-cos\right)\left(x+30\right)$
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