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visits member for 1 year, 9 months
seen May 5 at 17:56

Dec
11
comment Partial differentiation dz/ds when function of z is differentiable function of x and y but not given explicitly
Indeed. Thank you.
Dec
8
comment Using Green's theorem to compute an area of a region
Why is Q= 0 and P = y
Dec
8
comment Using Green's theorem to compute an area of a region
Hmm.. 3pi is right. But the answer, according to the key is positive 3pi though.
Dec
8
comment Using Green's theorem to compute an area of a region
pretty sure actually.
Nov
4
comment Integral of gradient dotted with dr
What is the gradient theorem?
Nov
4
comment Integral of gradient dotted with dr
I took the gradient of f and plug in r to obtain F to dot
Nov
3
comment Mass of wire described by curve with specified density function (Double integral)
Also, I'm not sure if copper.hat's method is valid or not. Can anyone confirm?
Nov
3
comment Mass of wire described by curve with specified density function (Double integral)
Is it because it is a "Wire" so you cannot integrate it the way I did above and have to use Line integral?
Nov
3
comment Evaluate double integral of triangular region
Right! It's 3 in the morning so I forget how to evaluate integrals. thank you!
Oct
2
comment Maximizing Directional Derivative
right, so it's <5,-8>. and so that's the direction vector of f?
Oct
2
comment Maximizing Directional Derivative
so I did that and I have: <2x +3 , -4y> for the gradient.
Sep
30
comment Limit of multivariable function, h approaching 0
sorry. I'm not sure what you mean.
Sep
30
comment Parametric equation of line parallel to a plane
@GerryMyerson sorry i forgot to mention that the question asked to solve for b such that the parametric equation of the line is parallel to the plane.
Sep
30
comment Parametric equation of line parallel to a plane
so I solve for vector v in: L(t) = r0 + tv?
Sep
30
comment Parametric equation of line parallel to a plane
do i just dot it with <2t+1, 3t-1, t+2> ?
Sep
30
comment Parametric equation of line parallel to a plane
oh sorry that was a typo there
Sep
30
comment arclength of vector r
yeah. Typo again sorry
Sep
30
comment arclength of vector r
oh! my bad. I fixed it now. There was a typo in the question: there were 3 components.
Sep
30
comment arclength of vector r
I'm not sure what you mean.
Sep
30
comment Vector cross product and dot product.
just a question, if i want to test if vector a is parallel to vector c or not then I'd just do a test to see if a x c = 0 . if its not then they are not parallel. If it is = 0 then a || c