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, Welcome back to Calculus One and welcome
to Week 5 of our time together. You know,

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at this point, you're probably wondering,
is there anything more to learn about

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derivatives? We've been spending so much
time on derivatives. Maybe we're done. No.

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There's tons more to do. In particular,
this week, we'll be doing the chain rule,

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which will let us differentiate
compositions of differentionable

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functions. And since tons of functions are
built by composing together

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differentionable functions, we're going to
be able to differentiate a ton more

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functions by the end of this week. Next
week, we're going to learn how to

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differentiate more functions, like sine
and cosine, and that'll set us up to see

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some incredible applications in the weeks
to come. The computations are getting

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harder. Hang in there, amazing
applications are yet to come.