Evaluating the composition of Functions

The video tutorial explains how to find the composition of cosine and cosine inverse of pi. It begins by evaluating the innermost function, which is the inverse of pi. The instructor highlights that cosine of theta equals pi is not possible because pi is not within the domain of the inverse cosine function. The domain for inverse cosine requires input values between -1 and 1, and since pi does not meet this criterion, the composition is deemed undefined.

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