can anyone help with this?

[hollow tiger]

1. Ask your question and show the work you've done so far. If you've posted a screenshot of a question, specify which part you need help with.
2. Wait patiently for a helper to come along.
3. Once someone helps you, say thank you and close the thread with:

   +close
   

4. Feel free to nominate the person for helper of the week in #helper-nominations
5. Do not ping the mods, unless someone is breaking the rules.
6. If you're happy with the help you got here, and the server overall, you can contribute financially as well:

[quasi robin]

The limit is in 0/0 form, so L'H applies

but generally you can compute the limit in terms of a,b,c, then Vieta's results to convert whatever thing you get to be in terms of alpha and beta

[sleek sluice]

Ohh thanks

[undone fern]

@sleek sluice has given 1 rep to @quasi robin