How Can I Use Calculus to Verify This Physics Equation?

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I'm supposed to use calculus to verify that v(t) = sqrt(gm/cd)tanh((sqrt(gcd/m)t)

is a solution to dv/dt=g-(cd/m)v2. I don't understand what was done to achieve the solution.
 
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While the derivation isn't hard, you aren't being asked to solve the differential equation as if you had no guess at the form of the solution space -- you are simply being asked to verify that that is a solution.
 
Agreed, what you list as a question is different than what you actually profess confusion in understanding.

The question wants you to verify v(t) is a solution. Did you misunderstand, or did you really wish to discuss how to obtain that solution?
 
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