The Inverse Laplace transform of L-¹ 36 [cos (4t 16 81 cos()+4 sin(- 9t cos()-4 sin( 4t cos()-9 sin( 9t 81 9t 16 cos (2) + 4 sin( 9t 9t 4t cos(- +9 sin(- 9t s+9 168² +81 is

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