Eric Nicholas K's answer to Elaine's Junior College 1 H2 Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
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Correct is this expression which equates to 7.219187054.

I am currently troubleshooting my previous answer, but if I am unable to find out the exact error in 15 minutes, I will continue at night.

The shape of the volume of rotation is something like a conical flask.