I'm having trouble figuring out what to do here, I'm supposed to find this limit:
$$\lim_{x\rightarrow0} \frac{x\cos(x)-\sin(x)}{x^3}$$
But I don't know where to start, any hint would be appreciated, thanks!
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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