[SEE DESCRIPTION] Edexcel Further Pure Maths IGCSE Past Papers | Jan 2012 P1 Q11

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WARNING: THERE IS A MISTAKE THAT COMPROMISES PARTS (b) AND (c) OF THIS PAST PAPER QUESTION. WHEN DIFFERENTIATING V WITH RESPECT TO H, I LEFT OUT THE (1/3)pi FACTOR. THANK YOU FOR YOUR ATTENTION! PLEASE SKIP TO (d) IF YOU FIND THIS UNSATISFACTORY.

Dedicated to active and early community member (~100 subs) Iva Shehu.

This is a fascinating 13 mark rates-of-change and volumes-of-revolution problem with a beautiful end part question. This video serves to explain volumes of revolution, also, in an intuitive way, as well as putting a focus on "dx" notation for infinitesimal change.
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Hey, WatchMeDoMath. this is a extremely enigmatic video. thanks. :)

colorizedenhansed-silentmo
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Amazing video! Thank you!!
Just a quick sidenote - in part b, wouldn't you also have to factor in 1/3pi into your differentiation? Or does it not make a difference? Again, thank you so much!

ivashehu
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This is genius!
BTW. Can you start a series of past papers like from 2009 to 2018, cause there are some questions that make me see stars.😁

anonymousb