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The set of all value of t  R, for which the matrix                      t sin e t cos e e ) t cos 2 t (sin e ) t cos t sin 2 ( e e ) t cos t sin 2 ( e ) t cos 2 t (sin e e t t t t t t 1 t t is invertible, is

1.          Z k , 2 ) 1 k 2 (
2. R
3.           Z k , 4 k
4. {k  , k  Z}

Correct answer: R

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