State the chain rule for finding 
for the general composite function involving 
Definitions:
Normal Aspect
A term typically used in various fields to denote a condition, perspective, or appearance that is considered typical or expected.
Causes of Death
Factors or events that directly lead to the death of an individual, ranging from diseases and accidents to various health conditions.
Main Causes
The primary or most significant factors or conditions that contribute to a particular outcome or event.
20th Century
A period extending from January 1, 1901, to December 31, 2000, marked by significant global changes in politics, technology, and culture.
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