Find: limx→π4sin4x1−√2cosx (no L'Hopital)
By L'Hopital it is easy to show that this limit is −4. But I'm not finding the right approach to prove without using it.
Hints and answers appreciated. Sorry if this is a duplicate.
I have injection f:A→B and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...
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