Finding the derivative

  • Thread starter Joyci116
  • Start date
  • #1
45
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Homework Statement


f(x)=(x2-x)(sin(x))


Homework Equations


Chain rule
Product rule


The Attempt at a Solution


f'g(x)*g'(x)
cosx

(2x-x)(cosx)

Would you use the product rule after using the power rule and chain rule?
 

Answers and Replies

  • #2
SammyS
Staff Emeritus
Science Advisor
Homework Helper
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Review the product rule !
 
  • #3
34,687
6,393

Homework Statement


f(x)=(x2-x)(sin(x))


Homework Equations


Chain rule
Product rule


The Attempt at a Solution


f'g(x)*g'(x)
cosx
???
This looks like you're attempting to use the chain rule.
(2x-x)(cosx)

Would you use the product rule after using the power rule and chain rule?
No. Use the product rule first. You don't need the chain rule at all.
 
  • #4
45
0
(x2-x)cosx+sinx(2x-1)

X2cosx-xcosx+2xsinx-sinx
 
  • #5
eumyang
Homework Helper
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10
That's more like it!
 

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