Second order partial derivatives

  • Thread starter tinkus
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  • #1
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Homework Statement



if z= f(x) + yg(x), what can you say about zyy explain?

Homework Equations





The Attempt at a Solution


z= f(x,yy)
zyy = d/dy (dz/dy) d(partial derivative)

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
lanedance
Homework Helper
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z = f(x,yy) this not correct, i am not sure what it means

try taking the partial derivative and see what you get

remember for partials, the other variable is kept constant during the differentiation, in this case x
 
  • #3
655
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Consider that d/dx (a(x,y) + b(x,y)) = d/dx a(x,y) + d/dx b(x,y).

Also recall that d/dx (a(x,y)*b(x,y)) = (d/dx a(x,y))*b(x,y) + a(x,y)*(d/dx b(x,y)).
 

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