Differentiation of exp(xy) wrt x

  • Thread starter j-lee00
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  • #1
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Please help

Differentiate exp(xy) w.r.t x

Thanks
 

Answers and Replies

  • #2
2,063
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You need to show your work/attempt.

And is y a function of x, or are x and y independent variables?
 
  • #3
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differentiate implicitly

exp(xy) = 0

i thought i would write it out but i dont know how to write the mathmatical symbols on screen
 
  • #4
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i thought i would write it out but i dont know how to write the mathmatical symbols on screen
Okay, then, use a (') to show a derivative. For example, y' will be the derivative of y w.r.t x.

differentiate implicitly

exp(xy) = 0
Do you know how to differentiate the exponential function?
 
  • #5
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exp(x)*exp(y)*y'+exp(y)+exp(x)
 
  • #6
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It sort of (but not quite) looks like you're differentiating exp(x)exp(y) rather than exp(xy). Those two are not equal.

What's the derivative of exp(f(x))?
 
  • #7
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i dont know i think thats my problem
 
  • #8
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i presume f'(x)*exp(f(x))
 
  • #9
367
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That's correct!

Now substitute f(x) = xy. What do you get?
 
  • #10
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ah thanks just forgot this simple derivation
 
  • #11
Mute
Homework Helper
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differentiate implicitly

exp(xy) = 0

i thought i would write it out but i dont know how to write the mathmatical symbols on screen
There is a problem with your implicit equation there: exp(xy) is never zero, it only approaches it asymptotically. (So technically, the surface doesn't exist, so neither does the derivative!)

But otherwise, you can just do what you did to get a derivative for other surfaces of exp(xy), e.g. exp(xy) = 5, which will produce a surface, and so the derivative will exist and you'd get the same derivative as if you tried to differentiate exp(xy) = 0.
 
  • #12
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i didnt give the whole equation because i could take the derivatives of the other functions
the full equation is x + y + exp(xy) = 0
 

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