1.

Let A=(abcd) be a 2×2 real matrix with detA=1. If the equation det (A−λI2)=0 has imaginary roots (I2 be the Identify matrix of order 2), then

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Let A=(abcd) be a 2×2 real matrix with detA=1. If the equation det (AλI2)=0 has imaginary roots (I2 be the Identify matrix of order 2), then



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