For some reason, blogger will not allow insertion of square root sign without mucking up the field and converting it to Greek. So rather than do that please note a correction for the solutions to Problem (1) given in the form: x = c1 sin (10)t + c2 cos (10)t + 0.05
So therefore replace the 10 with 10 Ö2
The other places with '10' should be similarly adjusted. The period will be likewise changed, as will the frequency. Simply replace 10 where it appears with the new quantity. Sorry for any inconvenience!