hartnn
 Name:

 School:
 About:
 There are some secret laws to become good in maths,
1) Practice,
2) More Practice,
3) More and more practice.
Need to know 4th ? ;)

0 
Questions Asked

hartnn:
Group Title
If ux+vy=a, u/x+v/y=1,show that
\[u/x (∂x/∂u)_v+v/y (∂y/∂v)_u=0\]
 updated yesterday
 5 replies
 1 Medal
Mathematics

hartnn:
Group Title
not sure where am i going wrong here...
…
 updated 9 days ago
 24 replies
 7 Medals
Mathematics

hartnn:
Group Title
Expand x/(e^x1) in powers of x.
looking for alternate methods,…
 updated 9 days ago
 39 replies
 6 Medals
Mathematics

hartnn:
Group Title
Ifx+y=2e^θ cos ϕ,xy=2ie^θ sin ϕ,& u is the function of x & y,then prove that
(∂^2 u)/(∂θ^2 )+(∂^2 u)/(∂ϕ^2 ) =4xy (∂^2 u)/∂x∂y
…
 updated 8 days ago
 52 replies
 4 Medals
Mathematics

hartnn:
Group Title
If x=cos θr sin θ,y=sin θ+r cos θ
prove that dr/dx =x/r
…
 updated 10 days ago
 28 replies
 3 Medals
Mathematics

hartnn:
Group Title
Find the inverse ZTransform of 
f(z)=(z+2)/(z^22z+1) ,z>1
…
 updated 16 days ago
 38 replies
 3 Medals
Mathematics

hartnn:
Group Title
If f(k)=4^k U(k)and g(k)=5^k U(k),
then find the ztransform of f(k).g(k)
…
 updated 16 days ago
 5 replies
 3 Medals
Mathematics

hartnn:
Group Title
Check my answer!
laplace Transform to solve IntegroDifferential Equation.
…
 updated 16 days ago
 1 reply
 1 Medal
Mathematics

hartnn:
Group Title
Prove that f_1 (x)=1,f_2 (x)=x,f_3 (x)=((3x^21))/2 are orthogonal over (1,1)
I know the method, Just need a start
…
 updated 16 days ago
 19 replies
 3 Medals
Mathematics

hartnn:
Group Title
Verify Laplace equation for U=(r+a^2/r) cos θ .Also find V and f(z)
I could verify,
…
 updated 16 days ago
 9 replies
 2 Medals
Mathematics

hartnn:
Group Title
Can MilneThompson Method be used to find the Real part of f(z) when Imaginary part is given ??
 updated 17 days ago
 17 replies
 5 Medals
Mathematics

hartnn:
Group Title
If cos(x+iy) cos(u+iv)=1,where x,y,u,v are real then show that tanh^2y cosh^2v=sin^2u
 updated 29 days ago
 45 replies
 5 Medals
Mathematics

hartnn:
Group Title
If a+ib=tanh(x+i π/4),prove that a^2+b^2=1
…
 updated one month ago
 19 replies
 3 Medals
Mathematics

hartnn:
Group Title
Unitary Matrix Problem, Not sure about my work, can anyone verify it or suggest an alternative approach by trying independently ?
 updated 2 months ago
 26 replies
 4 Medals
Mathematics

hartnn:
Group Title
2 easy questions
1) what does this notation mean ??
\(\Large (\dfrac{\partial u}{\partial x})_y \)
…
 updated 2 months ago
 23 replies
 6 Medals
Mathematics

hartnn:
Group Title
Show that
\( \Large (1e^{iθ} )^{(1/2)}+(1e^{(iθ)} )^{(1/2)}=(1+cosec(θ/2) )^{(1/2)} \)
 updated 2 months ago
 46 replies
 8 Medals
Mathematics

hartnn:
Group Title
show that
\(\Large \dfrac{ba}{\sqrt{1a^2}} < sin^{1}b  sin^{1}a < \dfrac{ba}{\sqrt{1b^2}}\)
 updated 2 months ago
 62 replies
 7 Medals
Mathematics

hartnn:
Group Title
if
\(\dfrac{(a+ib)^{x+iy}}{(aib)^{xiy}} = p+iq\)
…
 updated 2 months ago
 86 replies
 10 Medals
Mathematics

hartnn:
Group Title
If \(tan (\alpha +i\beta) = e^{i\theta}\)
find …
 updated 2 months ago
 45 replies
 8 Medals
Mathematics

hartnn:
Group Title
Forming Triple integral
z=0, z=1, x^2 +y^2 =4
 updated 2 months ago
 16 replies
 4 Medals
Mathematics

hartnn:
Group Title
Vector Calculus
Prove : (a is constant vector.)
\[\nabla \times [\dfrac{a\times \bar r}{r^n}] = \dfrac{2n}{r^n}a + \dfrac{n(a.\bar r)\ba…
 updated 2 months ago
 106 replies
 6 Medals
Mathematics

hartnn:
Group Title
Bilinear Transformation anyone ?
Find the image of the circle x^2+y^2=1,under the transformation w=(54z)/(4z2).…
 updated 2 months ago
 45 replies
 4 Medals
Mathematics

hartnn:
Group Title
Refreshing Differential Equations:
How do i solve …
 updated 2 months ago
 64 replies
 5 Medals
Mathematics

hartnn:
Group Title
Laplace Transform :
f(t) = a sin pt \(0<t\le \pi/p\)
f(t) = 0 \(\pi/p <t \le 2\pi/p \)
…
 updated 3 months ago
 22 replies
 3 Medals
Mathematics

hartnn:
Group Title
\(\Large \dfrac{π^4}{90}=\dfrac{1}{1^4} +\dfrac{1}{2^4} +\dfrac{1}{3^4} +\dfrac{1}{4^4} +⋯\)
 updated 3 months ago
 38 replies
 6 Medals
Mathematics

hartnn:
Group Title
Fourier integral representation.
Somewhere in my work, there is a sign error. Can anyone help me spot it ?
 updated 3 months ago
 2 replies
 1 Medal
Mathematics

hartnn:
Group Title
Fourier Series Expansion of sin x from (pi, pi)
 updated 3 months ago
 54 replies
 5 Medals
Mathematics

hartnn:
Group Title
Check my answers?
Also, can anyone work with me to find the line integral for question 6 c)
 updated 3 months ago
 67 replies
 4 Medals
Mathematics

hartnn:
Group Title
Verify my answer.
Bilinear Transformation.
…
 updated 3 months ago
 5 replies
 5 Medals
Mathematics

hartnn:
Group Title
Check my answer!
Find the analytic function f(z)=u+iv in terms of z if uv=(xy)(x^2+4xy+y^2 )
…
 updated 3 months ago
 3 replies
 2 Medals
Mathematics
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