October 6th, 2012, 07:03 PM  #1 
Newbie Joined: Oct 2012 Posts: 15 Thanks: 0  Calc
How to find derivative of y when y=4sin(sq rt x)2(sq rt x)cos(sq rt x)

October 6th, 2012, 07:32 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,204 Thanks: 511 Math Focus: Calculus/ODEs  Re: Calc
We are given: To differentiate, we will need to use the chain and product rules: 
October 6th, 2012, 07:42 PM  #3 
Newbie Joined: Oct 2012 Posts: 15 Thanks: 0  Re: Calc
find 2nd derivative of, f'', of f when f(x)= (x+2)/(x3)

October 6th, 2012, 07:47 PM  #4 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,204 Thanks: 511 Math Focus: Calculus/ODEs  Re: Calc
Use the quotient rule, twice. Post your attempt, and if you get stuck, I will help.

October 6th, 2012, 10:59 PM  #5  
Senior Member Joined: Aug 2012 From: New Delhi, India Posts: 157 Thanks: 0  Re: Calc Quote:
Now it is easier to apply your standard chain rule. I have noticed that sometimes quotient rule becomes too complicated. Therefore, it is much better to prefer algebraic reduction into easier functions. Regards, Rejjy 07Oct2012 12:28 IST  

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