To any one learning calculus if you're getting bogged down in all that " the limit as delta X goes to zero ..." stuff just forget about it. Instead, look up "n

To any one learning calculus if you're getting bogged down in all that " the limit as delta X goes to zero ..." stuff just forget about it. Instead, look up "non standard analysis" on wikipedia, use the dx and dy things as tiny tiny numbers and things will be much easier (and still correct).