Recent content by Lorentz_F

oh and the fist equation is wrong, the bit in the middle is as I've just posted, sorry, and i see your point on the function of x limits now

well the limits are Z=0, z=5, x=0, x=4, but what I'm after is what type of integration to use i.e. by substitution, parts, product malarchy or what? Just from looking at the bit \left(\frac{xz}{\sqrt{16-x^{2}}}+x\right) as I havn't the foggiest. Thank you.

Why hello, I have come across the surface integral \int\int(\frac{xz}{\sqrt{16-x^{2}}+x})dzdx My query is, which type of integration do I use to solve the first part of this double integral. The solution is: \int(4x+8)dz = 90

:approve: Thanks alot, I don't think i'll be needing anything more complicated than this so greatly appreciated. Laurence

I learned all the hard (at my level) bits like grad, div, curl and now I'm falling at the first hurdle on the exam papers: The question is: Express the circle of radius 3, centred at (1,0,3) and lying in the (x,z) plane in the form of r(t) = x(t)i + y(t)j + z(t)k I was hoping there was...