- #1
jaumzaum
- 434
- 33
What is wrong??
Hi,
I want to know where is the mistake in the statement below (I really don't know what is wrong, but it is obviously wrong)
[itex] \frac{\partial ^{2}x}{\partial t^{2}} = \frac{\partial ^{2}x}{\partial x^{2}} (\frac{\partial x}{\partial t} )^{2} [/itex]
But
[itex] \frac{\partial ^{2}x}{\partial x^{2}} = \frac{\partial \frac{\partial x}{\partial x}}{\partial x} = \frac{\partial 1}{\partial x} = 0[/itex]
This way:
[itex] \frac{\partial ^{2}x}{\partial t^{2}} = 0[/itex]
Thanks,
John
Hi,
I want to know where is the mistake in the statement below (I really don't know what is wrong, but it is obviously wrong)
[itex] \frac{\partial ^{2}x}{\partial t^{2}} = \frac{\partial ^{2}x}{\partial x^{2}} (\frac{\partial x}{\partial t} )^{2} [/itex]
But
[itex] \frac{\partial ^{2}x}{\partial x^{2}} = \frac{\partial \frac{\partial x}{\partial x}}{\partial x} = \frac{\partial 1}{\partial x} = 0[/itex]
This way:
[itex] \frac{\partial ^{2}x}{\partial t^{2}} = 0[/itex]
Thanks,
John