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(Solved): please answer in detail O Evaluate 0-1 t O 0 1 9 - ftsin t sin (9t)dt. 2 t cos(9t) + t cos (9t) - 81 ...
please answer in detail
O Evaluate 0-1 t O 0 1 9 - ftsin t sin (9t)dt. 2 t cos(9t) + t cos (9t) - 81 1 81 -sin(9t) + C si None of the other choices. -sin (9t) + C t²cos(9t) + C 1 1 t cos (9t)+sin(9t) + C