Let A = M2(ℝ) be a matrix which is not a diagonal matrix. Then which of the following is/are correct
1
If tr(A) = -1 and det(A) = 1 then A3 = I
2
If A3 = I then tr(A) = -1 and det(A) = 1
3
If A3 = I then A is diagonalizable over ℂ.
4
If A3 = I then A is diagonalizable over ℝ