Dear sage users and developers
trying to solve y''+4y=0 with initial conditions y(0)=0 and y'(0)=0
y=function('y',x)
eq=diff(y,x,2)+4*y==0
desolve(eq,y,ics=[0,0,0])
sage returns y(0)*cos(2*x) and not 0
What is wrong? The help for the desolve command shows the same
behavior on slighhtly more complicated example. I think that if I
state initial condition at 0, then y(0) is known and I can use this
knowledge and simplify answer - in my case into 0
Thanks
Robert
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