Hello all
When computing an exponential of matrix, I get complicate expressions,
for example :
var('x')
A=matrix( [ [0,1],[-1,0] ] )
(x*A).exp()
produces a matrix of things like :
1/2*(e^(2*I*x) + 1)*e^(-I*x)
Of course, that is equal to cos(x), as expected.
My question is : how to make Sage produce an output under a real form,
i.e. using cos(x) and sin(x) instead of combinations of imaginary
exponentials ?
I already tried to add this :
assume(imag_part(x)==0)
Any ideas ?
Thanks and have a good WE
Laurent
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