$f=2\pi\sqrt{\frac{m}{k}},\:k$
$\left(x^6+x^3+1\right)\left(x^3-1\right)$
$\left(4a+2b-5c\right)^3$
$y^{'\:}=e^x-\frac{2x}{x^2-1}$
$\frac{dy}{dt}=1-3y\left(t\right)$
$cos\left(45\right)=\frac{a}{60}$
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