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## Homework Statement

Let f(x)=cos(x^5). By considering the Taylor series for f around 0, compute f^(90)(0).

by the way, I don't know how super/sub script works?

## Homework Equations

## The Attempt at a Solution

I tried to substitute x^5 into x's Tyler Series form and solve for f^(90)(0), but it gave me a wrong answer.