This differential equation can be solved by separating the variables.
Dividing by e^r and multiplying by ds results in the variables r and s on the different sides of the equation:
This is equivalent to
Now we can take the integral of the both sides of the equation:
, where C is an arbitrary constant.
From here,
This differential equation can be solved by separating the variables.
Dividing by e^r and multiplying by ds results in the variables r and s on the different sides of the equation:
This is equivalent to
Now we can take the integral of the both sides of the equation:
, where C is an arbitrary constant.
From here,
and
or
Since the initial condition is r(0) = 0, we can find the constant C:
This means
and
Plugging C in in the equation for r(s) above, we can get the particular solution:
. This is algebraically equivalent to
. This is the answer.
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