$\lim_{x\to0}\left(\frac{cos^2x-1}{xsinx}\right)$
$80^4$
$\left(x+1\right)^2\left(x-1\right)\left(x-3\right)$
$6x^2-42x+5$
$\log\left(x+9\right)=1-\log\left(x\right)$
$\frac{d}{dx}\left(\left(ln\left(1+e^x\right)\right)^3\right)$
$y^{'\:}=e\frac{e^{-x}}{seny};\:y\left(1\right)=0$
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