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Section 3.9 : Chain Rule

13. Differentiate \(h\left( z \right) = \sin \left( {{z^6}} \right) + {\sin ^6}\left( z \right)\) .

Hint : Don’t get too locked into problems only requiring a single use of the Chain Rule. Sometimes separate terms will require different applications of the Chain Rule, or maybe only one of the terms will require the Chain Rule.
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For this problem each term will require a separate application of the Chain Rule and don’t forget that,

\[{\sin ^6}\left( z \right) = {\left[ {\sin \left( z \right)} \right]^6}\]

So, in the first term the outside function is the sine function, while the sine function is the inside function in the second term. The derivative is then,

\[\require{bbox} \bbox[2pt,border:1px solid black]{{h'\left( z \right) = 6{z^5}\cos \left( {{z^6}} \right) + 6{{\sin }^5}\left( z \right)\cos \left( z \right)}}\]