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David K Butler
davidkbutler.bsky.social
did:plc:62z5zvrhttrg3dtn5j3myks3
For ∫sin(x)*e^cos(x)dx,
I would set u=cos(x).
I have a feeling it probably would work to set u=e^cos(x), but I’m absolutely certain u=cos(x) will work and its not worth trying something else if I’m time poor, and definitely not worth remembering a whole separate trick for one specific situation.
2025-10-09T06:11:44.856Z