This section was not too terribly difficult, and rather short too. But its good to know that the derivative of sine is cosine. But what I found the most difficult is that the reverse is not true. The derivative of cosine is not sine, it is -sine. Why is that?
I think the most difficult thing the class will work with is looking at a function and having to figure out which of all the available rules we were introduced to in this chapter to use!
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