Looks like it could be a good site. However one should make sure they don't get caught in a circular argument. I had a text book one time which proved that
\(\displaystyle lim_{x\to0}\frac{sin(x)}{x} = 1\)
by using the derivative of sin(x). Then, somewhere down the road proved
\(\displaystyle \frac{d sin(x)}{dx} = cos(x)\)
by using sin(h)/h went to 1 as h goes to zero. Talk about a chicken and egg problem
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