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# C3 chapter 8 question! watch

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1. This is probably as silly question, but how would you differentiate y=square root of sinx? Thanks for any help! 😊
2. (Original post by 08rgill)
This is probably as silly question, but how would you differentiate y=square root of sinx? Thanks for any help!
Use the chain rule.
3. (Original post by usycool1)
Use the chain rule.
Thanks! I'm going to try that now!
4. (Original post by usycool1)
Use the chain rule.
Right, I don’t know if what I’ve done is correct:
Y=
Y=(sinx)^1/2
Y=u^1/2
Dy/du= 1/2u^-1/2
U=sinx
Du/dx= cosx
Dy/dx= 1/2u^-1/2 times cosx
=1/2sinx^-1/2cosx
How do I simplify further? Thanks!
5. I think at the end you might want to put brackets round it

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6. (Original post by lilanis)
I think at the end you might want to put brackets round it

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7. Don't worry! I think I've got it now! Thanks for you help!

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Updated: December 3, 2014
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