This just came up on my TL.
I need to commend you. π
Regardless of the method, you should get the same result. Your mistake starts at the 4:00 mark in the video.
Integrate u w.r.t. u to get uΒ²/2 c,
Then, substitute back the original value of u, which is (xΒ² 5)Β² c.βοΈ
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