May I try this one again?  In the answer given the fourth line down has "u^2=t^2+1" and I believe using "t^2=u^2+1" from three lines above would mean "u^2=t^2-1". Please solve this again.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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May I try this one again?  In the answer given the fourth line down has "u^2=t^2+1" and I believe using "t^2=u^2+1" from three lines above would mean "u^2=t^2-1".

Please solve this again.

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