u= To integrate 3 things, do you use integration by parts twice? Such as.... ∫udv = uv - ∫vdu Where U = e4t and dv = 1/t3 What ever the answer goes into another integration by parts as u? ∫udv = uv - ∫vdu Where u = The answer above and dv = cost(t)? Please let me know if I had to right idea and procced in helping me lut. Thank you!

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