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CIE- A Level June 2013 Mathematics P1 9707/12

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Hello sir! I'm afraid you made a mistake in the part (iii) of this question. If d^2s/dr^2 has a positive value, the curve/nature should be minimum. You wrote maximum there. Thank you for the solutions though, they're really useful and informative!


Here is the video where the mistake was corrected :
 
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Thanks Mr Binyamine. I am a big fan of yours. You seemed angry in this thread. Thanks for your video solution.
 
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Love you bro.. =P
Thank you soooooo much.. =D
May Allah grant you the best of the best.. ^.^
 
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