Problem 01 | Separation of Variables

Problem 01
$\dfrac{dr}{dt} = -4rt$,   when   $t = 0$,   $r = r_o$
 

Solution 01

 

Comments

My Ph.D. instructor told me "how did you get ln c?", how can I explain this?

$r(t) = r_0$ is also a solution

Whre did u get lnc? Im confused

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