Taking Cosine of Quantum Opertor

[Raman Sehgal]

Hello Sympy experts,

I am trying to do some quantum mechanics using sympy

I want to take cosine of an quantum operator matrix

I didn't find any function in Quantum Operator that will help me.

could you please help me with that, or suggest how it can be done

Regards,

[S.Y. Lee]

Unfortunately, there may not be any API to compute the matrix cosine or a matrix sine

(I'm not familiar with the topic of quantum mechanics, but if you mean by computing the matrix-valued functions with diagonalization)

And unfortunately, I'm not very willing to introduce some new matrix-functional API until expression blowup problems are resolved,

but as there already is `Matrix.exp` method, you can be able to compute matrix cosine from the exponential with the Euler identity.