Friday 18 January 2019

reference request - Overview of basic results about images and preimages

Are there some good overviews of basic facts about images and inverse images of sets under functions?

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real analysis - How to find $lim_{hrightarrow 0}frac{sin(ha)}{h}$

How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...