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[qquad (" EXAMPLE "17." If "A=)/(tan(alp...

[qquad (" EXAMPLE "17." If "A=)/(tan(alpha)/(2))" and "(-tan(u)/(2))/(0)" and I is the unit matrix of order "2times2:" show "],[" It "A=(1-A)[[cos alpha,-sin alpha],[cos alpha,0]]" ."]

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If A=[(0,-"tan"(alpha)/(2)),("tan"(alpha)/(2),0)] and I is the identity matrix of order 2, show that I+A=(I-A)[(cos alpha,-sin alpha),(sin alpha, cos alpha)]

If A=[(0,-"tan"(alpha)/(2)),("tan"(alpha)/(2),0)] and I is the identity matrix of order 2, show that I+A=(I-A)[(cos alpha,-sin alpha),(sin alpha, cos alpha)]

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