Recent content by platinumrice

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    Undergrad I don't understand how partial derivatives work exactly

    http://i.stack.imgur.com/k3yxD.jpg
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    Undergrad I don't understand how partial derivatives work exactly

    i know that, but in this case, you have several derivatives.
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    Undergrad I don't understand how partial derivatives work exactly

    what does d/ds (e^s cos(t)du/dx + e^s sin(t)du/dy) give, given that u = f(x,y) i don't know how to manipulate d/ds and how to derive using d/ds. i am trying to simplify the expression, but i don't know, i just get stuck in the middle of can't get farther than here...
    • platinumrice
    • Thread
    • Derivatives Partial Partial derivatives Work
    • Replies: 5
    • Forum: Calculus
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    Partial derivative chain rule proof

    http://s10.postimage.org/fksqxnn3r/image.jpg i got 6 terms, but the results are not the same for some reason and i am stuck. it has been like 2 hours and it has been really frustrating
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    Partial derivative chain rule proof

    Homework Statement If u=f(x,y) where x=escost and y=essint show that d2u/dx2+d2u/dy2 = e-2s[d2u/ds2+d2u/dt2 Homework Equations http://s11.postimage.org/sjwt1wkvl/Untitled.jpg The Attempt at a Solution ok i don't understand how they got to that i don't know what d/ds is...