Complete in matlab

$1\mathrm{.}1$ Use calculus to verify that Eq$.(1\mathrm{.}9)$ is a solution of Eq$.(1\mathrm{.}8)$ for the initial c

$v(t)=\sqrt[\phantom{2}]{\frac{gm}{c_d}}tanh(\sqrt[\phantom{2}]{\frac{g{c}_d}{m}}t)$ondition $v(0)=0.$

$\frac{dv}{dt}=g-\frac{c_d}{m}{v}^2$ eq$(1\mathrm{.}8)$