How do I find the 20th derivative of f(x)=(2cos x)(cos 3x)? I think there must be some trick because this was on a timed test with about 40 questions.

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
ChapterP: Prerequisites
SectionP.6: Analyzing Graphs Of Functions
Problem 6ECP: Find the average rates of change of f(x)=x2+2x (a) from x1=3 to x2=2 and (b) from x1=2 to x2=0.
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How do I find the 20th derivative of f(x)=(2cos x)(cos 3x)? I think there must be some trick because this was on a timed test with about 40 questions.

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