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[" If "A=[[0,-tan(a/2)],[tan(a/2),0]]" ,...

[" If "A=[[0,-tan(a/2)],[tan(a/2),0]]" ,and "1" is the identity matrix of order "2" ,show that: "],[qquad HA=(|-A)|[cos a,-sin alpha],[sin a,cos a]]]

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