then i divide both sides by dy

then i divide both sides by y

so i have here a bernuly foruma

i divide both sides by

z is defined to be a function of x

so

why the book interprets

??

- August 16th 2009, 02:49 AMtransgalactichow to know here on what variable its a derivative of..(diff)

then i divide both sides by dy

then i divide both sides by y

so i have here a bernuly foruma

i divide both sides by

z is defined to be a function of x

so

why the book interprets

?? - August 16th 2009, 03:24 AMrunning-gag
and x is a function of y, therefore z is also a function of y

This is already what you have considered when you wrote - August 16th 2009, 03:30 AMtransgalactic
z is linked to y not in a direct way .

but z linked to x in a direct way

z and x are more close to each other.

i cant see a mathematical way of figuring it out

its all intuition.and i my intuition is very bad - August 16th 2009, 05:21 AMrunning-gag
When you write with x function of y (in other words x = x(y)), you write a relation between two functions

It is the same as writing - August 16th 2009, 05:26 AMtransgalactic
ok thanks