Derivative Problem

  • Thread starter I'm
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  • #1
I'm
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Homework Statement



What's the 39th derivative of cosx?



Homework Equations



1st dy/dx: -sin x
2nd: -cosx
3rd: sinx
4th; cosx


The Attempt at a Solution



So it repeats every 4
so I used 39/4 and for a remainder of 3 so is is the 3rd one down?

I got sin x but I don't know if thats the way its supposed to be done ( the remainder is the number of derivative the answer is)
 

Answers and Replies

  • #2
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Yes, this is the way it should be done.
 
  • #3
lanedance
Homework Helper
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sounds reasonable to me
 

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