Question

AB=BA=I
${a}^{n} = | \cos(nx) \: \sin(nx) \\ \: \: \: \: \: \: \: \: \: \: \: \: \ - \sin(nx \: ) \: cos(nx) \: |$
it is 2 by 2 matrix solve for A​

Answer 1

A = | cosx sinx |

| -sinx cosx|

put n = 1


u will get the answer


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