Derivation of f(x)=xcos(sen(x)) – 1

  • Thread starter schmitt
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  • #1
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Hi Could someone help me derivating this function:

f(x)=xcos(sen(x)) – 1
f'(x)= ?
f''(x)= ?

Thank you.
 

Answers and Replies

  • #2
I like Serena
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Hi Could someone help me derivating this function:

f(x)=xcos(sen(x)) – 1
f'(x)= ?
f''(x)= ?

Thank you.

What kind of function is sen(x)?
Or did you mean sec(x)?
 
  • #3
274
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If that sen(x) is indeed a sec(x) then just use the product rule between x and cos(sec(x)). The -1 becomes 0. When you get the new function derive it again and you'll have f''(x).

You might be asking for the answer in which case I won't be giving you because you'll never learn it yourself.

Woops. Just realized that mistake I made. That was embarrassing.
 
Last edited:
  • #5
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You are going to need to use the product rule and the chain rule, in that order.

BTW, there is no such word as "derivating" in English, and I doubt that it is a word in any other language. To find the derivative of a function, we differentiate the function - we don't "derivate" it or "derive" it.

Starting with ax2 + bx + c = 0, I can derive the Quadratic Formula, but this has nothing to do with differentiation.
 
  • #6
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Got it solved already, sorry for the bad english.
Topic can be deleted.
 
  • #7
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We don't delete the topics so that other people with similar questions can learn from them.
 

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