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January 1st, 2017, 05:49 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 |
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January 1st, 2017, 06:16 AM | #2 |
Math Team Joined: Jul 2011 From: Texas Posts: 2,738 Thanks: 1388 | |
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January 1st, 2017, 04:42 PM | #3 |
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,780 Thanks: 1025 Math Focus: Elementary mathematics and beyond |
$$5e^x-4e^{-x}=8\sinh x+e^x=8\sinh x+ \sinh x+\cosh x=9\sinh x+\cosh x$$
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January 4th, 2017, 01:56 PM | #4 |
Newbie Joined: Oct 2015 From: huddersfield Posts: 16 Thanks: 1 | unfortunately not, more studying required on this topic i think
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January 4th, 2017, 02:00 PM | #5 |
Math Team Joined: Jul 2011 From: Texas Posts: 2,738 Thanks: 1388 | |
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January 4th, 2017, 02:44 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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identities, trigonometric |
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