April 22nd, 2017, 10:47 AM  #1 
Senior Member Joined: Dec 2015 From: Earth Posts: 833 Thanks: 113 Math Focus: Elementary Math  Extremum values
Find extremum value of $\displaystyle \;$$\displaystyle y=\frac{1}{2} x^2 +cosx$

April 22nd, 2017, 11:19 AM  #2 
Senior Member Joined: May 2016 From: USA Posts: 1,310 Thanks: 552 
What is the general method for finding extrema of differentiable functions? What did you get when you tried that? 
April 22nd, 2017, 12:49 PM  #3 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 
You are not going to be able to find a simple numerical solution to , you will need some sort of numerical solution.

April 22nd, 2017, 02:05 PM  #4 
Senior Member Joined: Sep 2015 From: USA Posts: 2,647 Thanks: 1476  

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