dcm18 Posted September 16, 2007 Share Posted September 16, 2007 I was hoping someone can help me out here...... What is the Partial Derivative for the following fuctions: d^2/dx^2 (e^(-i (3x+2y)) ) d/dx √(x^2+y2) Any guidance would be much appreciated! Thanks Link to comment Share on other sites More sharing options...
PhDP Posted September 17, 2007 Share Posted September 17, 2007 Where are you getting stuck ? It shouldn't be too hard to solve if you remember the basic rules; [math] \frac{d}{dx} f(x)^a = af(x)^{a-1}\times \frac{df(x)}{dx} [/math] [math] \frac{d}{dx} e^{f(x)} = e^{f(x)} \times \frac{df(x)}{dx} [/math] [math] \frac{d}{dx} f(y) = 0 [/math] Link to comment Share on other sites More sharing options...
Country Boy Posted September 17, 2007 Share Posted September 17, 2007 Notice that Phil has written that entirely in terms of ORDINARY derivatives. That's perfectly correct- you just have to remember that since all of the partial derivatives are with respect to x, that "y" is just a constant. Link to comment Share on other sites More sharing options...
dcm18 Posted September 17, 2007 Author Share Posted September 17, 2007 OH ok ......Thanks a lot guys that was a big help Link to comment Share on other sites More sharing options...
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