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How did who decide some of the steps to choose for developing the Chain Rule and for developing the derivative of the Sine function? I spent some time during the last few days reading and examing these derivations, and although now I can understand those, the steps taken do not seem very obvious; meaningful and correct, yes so they seem; but how to know to choose those particular steps, not at all obvious.
Did those who derived these rules use special proof techniques which are commonly taught in some transitional or upper division courses? Were those people simply clever geniuses?
Did those who derived these rules use special proof techniques which are commonly taught in some transitional or upper division courses? Were those people simply clever geniuses?