January 1st, 2017, 06:49 AM  #1 
Newbie Joined: Oct 2015 From: huddersfield Posts: 16 Thanks: 1  trigonometric identities
given 5e^x  4e^x ≡A sinh x + B cosh x Find A and B 
January 1st, 2017, 07:16 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,120 Thanks: 990  
January 1st, 2017, 05:42 PM  #3 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,366 Thanks: 833 Math Focus: Elementary mathematics and beyond 
$$5e^x4e^{x}=8\sinh x+e^x=8\sinh x+ \sinh x+\cosh x=9\sinh x+\cosh x$$

January 4th, 2017, 02:56 PM  #4 
Newbie Joined: Oct 2015 From: huddersfield Posts: 16 Thanks: 1  unfortunately not, more studying required on this topic i think

January 4th, 2017, 03:00 PM  #5 
Math Team Joined: Jul 2011 From: Texas Posts: 2,120 Thanks: 990  
January 4th, 2017, 03:44 PM  #6  
Newbie Joined: Oct 2015 From: huddersfield Posts: 16 Thanks: 1  Quote:
of course, i couldnt see the wood for the trees in that instance i had got myself so confused in the other questions i am doing, i had the answer for this one a long time ago, your method and stages really helped me so thank you  

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