Express a 90 degree rotation matrix in terms of a 180 degree rotation matrix? (both anti-clockwise)

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A =
[-1 0 0 ]
[ 0-1 0 ]
[ 0 0 1 ]

B =
[0 -1 0 ]
[ 1 0 0 ]
[ 0 0 1 ]

How can i represent B in terms of A?