isabel_xxvi
Check: second derivative for : xy=(x+y)^2



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isabel_xxvi
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\[\frac{ 4 }{ (2x+2y+1)^2 }\]

isabel_xxvi
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not sure if this is correct

Decart
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did you differentiate implicity

isabel_xxvi
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yeah

Decart
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i did this a few weeks ago don't really remember i know we take the y and make a y prime

Decart
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the first dirivative would be y'=2(x+y)y' right
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isabel_xxvi
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uhm is it 1?