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I don't understand how to do the second derivative. b) [3 marks] If f is a function of u and v, where u = 2r

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I don't understand how to do the second derivative.

image text in transcribed
b) [3 marks] If f is a function of u and v, where u = 2r - s and v = r + s, use the chain rule to find of Of 22 f of of arf arf and ar' as in terms of as Or Ou' av' du2' 202 and 22 f au av

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