How to approach this exercise? I've tried a lot of methods and always reached 0/0.
How to approach this exercise? I've tried a lot of methods and always reached 0/0.
I think you mean
The case 0/0 is very common in limits, so you have essentially to simplify something in order
to get a value (for instance, even is a 0/0
but you can simplify it). A first rule you can use is de l'Hopital rule: essentially
(under rather weak conditions) if
is a 0/0, then
.
An alternative approach it to use several identities: first so
Using
you get
.
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