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Subject: dsolve
Date: Thu, 13 Jun 2013 12:51:14 +0000 (UTC)
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In Shampine et al. "Solving ODEs with MATLAB" (2003), p. 18, Exercise 1.1, an example from MATLAB (2000) "help dsolve" is cited:

>> Y = dsolve('(Dy)^2 + y^2 = 1', y(0) = 0')

with the correct solution

Y = [  sin(t) ]
      [ -sin(t) ]

Now, with Matlab 2012a student, for an identical input I get the solution

Y =
  cosh((pi*i)/2 + t*i)
  cosh((pi*i)/2 - t*i)
 
which seems to me to be wrong.

What should I do?
Helmut