October 28th, 2018, 09:58 PM  #1 
Senior Member Joined: Apr 2017 From: New York Posts: 118 Thanks: 6  jacobian
hi guys, what is my next step please? I stucked. 
October 28th, 2018, 10:08 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,172 Thanks: 1142 
You've got a sign error in $J_{2,2}$

October 28th, 2018, 11:12 PM  #3 
Senior Member Joined: Apr 2017 From: New York Posts: 118 Thanks: 6 
Thanks. Let me correct it. After that how should I continue? 
October 29th, 2018, 12:50 AM  #4 
Senior Member Joined: Sep 2015 From: USA Posts: 2,172 Thanks: 1142 
there's not a ton you can do to it. You can apply a trig or hyptrig identity to simplify it a bit but that's about it. 
October 29th, 2018, 02:43 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 19,878 Thanks: 1835 
After correcting the sign, the result can be simplified a little by use of standard identities.


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