Let u(x, y) be a twice differentiable function. Show that in polar coordinates the Laplacian of u takes the form... .
Should be an easy Q but i cant remember how to do the second derivative. = .
But then how do you take the second derivative?
Follow Math Help Forum on Facebook and Google+
replace x = rcos(theta) y = rsin(theta)
This won't be pleasant but:
Uxx = (Ux)x so in replace U with Ux
similarly for Uyy
View Tag Cloud