Question: e - 2 t cos ( 2 t ) = ? [ e - ( 2 - 2 j ) t + e - (

e -2 t cos(2 t )=?
[ e -(2-2 j ) t + e -(2+2 j ) t ]/2
[ e (2-2 j ) t + e (2+2 j ) t ]/2
[ e -(2-2 j ) t + j e -(2+2 j ) t ]/2
[ e (2-2 j ) t + j e (2+2 j ) t ]/2

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