$y\:+5y'+10y=510e^2tcos6t$
$\int\frac{1}{4}x^2\:dx$
$4-cos^2\left(a\right)$
$6x=54$
$\frac{dy}{dx}\left(x^2cos^2\left(y\right)=2x^4\right)$
$-5x^7\cdot x^{-11}\cdot2x^4$
$\left(12-15+9-7\right)-\left(2-13+6-1\right)$
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