6t cos (3t - 5)
2t sin (3t - 5) - 3t2 cos (3t - 5)
2t sin (3t - 5) + 3t2 cos (3t - 5)
2t sin (3t - 5) + t2 cos 3t
Correct answer is C
t2 sin (3t - 5) = 2t sin ( 3t - 5) + t2 x 3 cos (3t - 5) = 2t sin (3t - 5) + 3t2 cos (3t - 5)
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