I'm supposed to use calculus to verify that v(t) = sqrt(gm/c(adsbygoogle = window.adsbygoogle || []).push({}); _{d})tanh((sqrt(gc_{d}/m)t)

is a solution to dv/dt=g-(c_{d}/m)v^{2}. I don't understand what was done to achieve the solution.

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# Using calculus to verify

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