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Considering how many fools can calculate, it is surprising that it should be thought either a di cult or a tedious task for any other fool to learn how to master the same tricks. Some calculus-tricks are quite easy. Some are enormously di cult. The fools who write the textbooks of advanced mathematics and they are mostly clever fools seldom take the trouble to show you how easy the easy calculations are. On the contrary, they seem to desire to impress you with their tremendous cleverness by going about it in the most di cult way.