April 22nd, 2017, 09:47 AM  #1 
Senior Member Joined: Dec 2015 From: somewhere Posts: 640 Thanks: 91  Extremum values
Find extremum value of $\displaystyle \;$$\displaystyle y=\frac{1}{2} x^2 +cosx$

April 22nd, 2017, 10:19 AM  #2 
Senior Member Joined: May 2016 From: USA Posts: 1,310 Thanks: 551 
What is the general method for finding extrema of differentiable functions? What did you get when you tried that? 
April 22nd, 2017, 11:49 AM  #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, 01:05 PM  #4 
Senior Member Joined: Sep 2015 From: USA Posts: 2,553 Thanks: 1403  

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