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volume integration Q (1 Viewer)

indeed

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Hi all, what's the reasoning behind why the solutions isn't (tan x)^2 - y^2?

Thank you!
 

indeed

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Maybe I'm missing something but that solution does not seem to be correct. (tany)^2-y^2 should be correct
I think the solutions are right, there's some sort of special rule, but i cant figure out what the rule is
 

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