$\lim_{x\to0}\left(\cos^4\left(x\right)\right)$
$-4\left(-6x+18\right)$
$x^2+6x-18$
$\left(30k^3\right)\left(6k^2\right)$
$12.5+0.032-3.2-7.328+73.28-6.4-3.2$
$\lim_{x\to0}\left(\frac{e^x+x-1}{e^x-1}\right)$
$seny\:dx-cosx\:dy=0$
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