$\frac{dy}{dx}+4y=e^{-x}$
$r^2-36$
$-8x=64$
$430.2+457+0.005+18.73$
$3\sqrt{16}$
$x^{10}-14x^5b+49b^2$
$\frac{sec\left(u\right)}{\sec\left(u\right)-1}=\frac{1}{1-cos\left(u\right)}$
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