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Homework Statement
Derive the volume of sphere using Calculus. i saw videos on this topic on youtube, but i want to do it by the method of integrating a circle at angle θ (Theta) . i am posting a photo where i explained every thing i did but i couldn't know what i am doing wrong.
Homework Equations
Integrating a circle of radius r at angle θ (Theta)
The Attempt at a Solution
https://drive.google.com/open?id=1Va32w9eCJE_2nH4VIPqG8bFHRzcKuvIF[/B]
Attachments

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