Find limx→0tan2xx
I change tan to sin/cos , we have limx→0sin2xxcos2x
Using l'Hopital's rule,
I get limx→0cos2x(x)(−sin2x)(cos2x) = limx→0−1(x)(sin2x)
I can't proceed with l'Hopital's rule anymore here as I get 1/0.
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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