If A=[[cos alpha, -sin alpha],[ sin al...

If `A=[[cos alpha, -sin alpha],[ sin alpha, cos alpha]]`, then the number of values of `alpha`in `(0, pi)` satisfying `A+A^T=I_,` is [Note: `I` is an identity matrix of order 2 and `P^T` denotes transpose of matrix `P .]`

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