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If A=[{:(0,"tan"(alpha)/(2)),("tan"(alph...

If `A=[{:(0,"tan"(alpha)/(2)),("tan"(alpha)/(2),0):}]`and I theidentity matrix of order 2, show that `I+A=(I-A)[{:(cosalpha,-sinalpha),(sinalpha,cosalpha):}]`.

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