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Can someone please look over my work to see If i did it correctly? I've been stuck on this problem for over 2 hours now and I just cant seem to come up with the solution that WileyPlus online wants me to come up with.

The funny thing is that the equivalent question in my textbook has a similar answer to mine, however it is slightly different because my online homework (WileyPlus) gave me the initial condition y(pi/2) = 9.... where as my text gives initial condition y(pi/2) = 1...

Here is a picture of the first part of the problem that I computed... which according to wolfram Alpha plus, is correct.

https://docs.google.com/file/d/0B9dQB0QE48ufNHpRRWptRDRBQkE/edit?usp=sharing

When I computed C, given initial condition y(pi/2) = 9.... I came up with

C = (4 - 9pi^2)/4

for a final answer of...

y(t) = ( sin(t) - tcos(t) + (4-9pi^2)/4 ) / t^2

However, Wiley Plus insists that my answer is incorrect. I have redone this problem probably 5 or 6 times and i keep coming up with the same answer.

I am literally stuck!

Please help