HOW DO I DO THIS?!
Solve
Help... please ...
need someone to go through slowly with me lol :S
You should note that , so
and .
From the second equation, we can see that either or .
If then
and since the hyperbolic cosine is always positive, that means we can only accept even values for , so and .
So the first solution is .
See if you can get the second solution, for where .