f(S∩T)≠f(S)∩f(T)
but
f−1(Q∩R)=f−1(Q)∩f−1(R)
Can you explain it in simple terms, so I understand why and develop the intuition to see if a statement is true or false just by looking at it?
How to find limh→0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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