STUPIDSID
1 (a)
\[A=\frac{1}{7}\ \left[\begin{array}{ccc}2 & 6 & 3 \\6 & -3 & 2 \\3 & 2 & -6\end{array}\right]\]
Show that-
(i) |A| = 1
(ii) .adj A=A'
Show that-
(i) |A| = 1
(ii) .adj A=A'
5 M
This Qs paper appeared for Applied Mathematics - 3 of Electronics & Telecomm. (Semester 3)
1 (b)
Show that the Fourier cosine transform of-
\[f\left(x\right)=\ \frac{1}{\sqrt{x}}\ is\ \frac{1}{\sqrt{s}}\]
\[f\left(x\right)=\ \frac{1}{\sqrt{x}}\ is\ \frac{1}{\sqrt{s}}\]
5 M
1 (c)
Show that
\[ L^{-1}\ {tan}^{-1}\left(\frac{a}{s}\right)=\ \frac{sin?(at)}{t}\ \]
\[ L^{-1}\ {tan}^{-1}\left(\frac{a}{s}\right)=\ \frac{sin?(at)}{t}\ \]
5 M
1 (d)
Show that
\[ \int_0^{\infty}e^{-t} \sin \left( \frac{t}{2}\right) \sin h{\ \left(\frac{\sqrt{3}t}{2}\right)}\ dt=\ \frac{\sqrt{3}}{2} \]
\[ \int_0^{\infty}e^{-t} \sin \left( \frac{t}{2}\right) \sin h{\ \left(\frac{\sqrt{3}t}{2}\right)}\ dt=\ \frac{\sqrt{3}}{2} \]
5 M
2 (a)
If z is any zero complex number show that -
[A=frac{1}{sqrt{2} vert{}zvert{}}left[egin{array}{cc}z
[A=frac{1}{sqrt{2} vert{}zvert{}}left[egin{array}{cc}z
6 M
2 (b)
Find the Fourier series expansion of f(x)=x2 in [0,2?]
6 M
2 (c)
Show that
\[\int_0^{\infty{}}\frac{\sin{2t+\sin{3t}}}{te^t}dt=\ \frac{3\pi{}}{4}\]
\[\int_0^{\infty{}}\frac{\sin{2t+\sin{3t}}}{te^t}dt=\ \frac{3\pi{}}{4}\]
8 M
3 (a)
Find the half range sine series for f(x) = ?x - x2 in [ 0, ? ]. Hence find \[\sum_{n=1}^{\infty{}}\frac{1}{{(\ 2n-1)}^6}\]
6 M
3 (b)
Show that
\[L(cos\ at\ cosh\ at)=\frac{s^3}{s^4+\ 4a^4}\]
\[L(cos\ at\ cosh\ at)=\frac{s^3}{s^4+\ 4a^4}\]
6 M
3 (c)
if a,b,c are distinct real numbers such that a+b+c ? 0. Show that the vectors (a,b,c), (b,c,a) and (c,a,b) are linearly independent.
8 M
4 (a)
Find Fourier series expansion of -
\[ f(x)=\left\{\begin{matrix}x &-?
\[ f(x)=\left\{\begin{matrix}x &-?
6 M
4 (b)
Find the all possible ranks of the matrix
\[A=\left[\ \begin{array}{ccc}k & -3 & -3 \\-3 & k & -3 \\-3 & -3 & k\end{array}\right]\]
where k is any real number
\[A=\left[\ \begin{array}{ccc}k & -3 & -3 \\-3 & k & -3 \\-3 & -3 & k\end{array}\right]\]
where k is any real number
6 M
4 (c)
Find
\[ (i) \ L^{-1}\ \dfrac{se^{-?s}}{s^2+3s+2}; \ (ii) \ L [t. H(t - 4)+t^2 \ ?(t-4)] \]
\[ (i) \ L^{-1}\ \dfrac{se^{-?s}}{s^2+3s+2}; \ (ii) \ L [t. H(t - 4)+t^2 \ ?(t-4)] \]
8 M
5 (a)
Solve the system of equation using the Gauss- Seidel method :
3x+4y+6z=6
2x+5y+4z=11
2x+y+z+=5
3x+4y+6z=6
2x+5y+4z=11
2x+y+z+=5
6 M
5 (b)
Find \[{\ L}^{-1}\frac{s}{{\left(s^2+\ 2\right)}^2}\]using convolution theorem
6 M
5 (c)
Show that
\[z[\cos\ {(\alpha \ k)]=\ \frac{z^2-z\cos \alpha}{z^2-2(\cos{\alpha)z+1}}}\]
\[z[\cos\ {(\alpha \ k)]=\ \frac{z^2-z\cos \alpha}{z^2-2(\cos{\alpha)z+1}}}\]
8 M
6 (a)
Find Lf(t) where f(t) = cos t, 0 < t < ?
sin t, sin t ? ?
Using the Heaviside unit step function.
sin t, sin t ? ?
Using the Heaviside unit step function.
6 M
6 (b)
Find \[Z^{-1}\frac{1}{(z-2)(z-3)}\]for 2<|z|<3 using residues.
6 M
6 (c)
Express the matrix
\[A=\left[\begin{array}{ccc}\sin{\alpha{}} & 0 & \sin{\alpha{}} \\\left(sin\ \alpha{}\right)\ (sin\beta{}) & cos\beta{} &-\left(sin\beta{}\right)\left(cos\alpha{}\right) \\-(cos\beta{})(sin\alpha{}) & sin\beta{} & (cos\alpha{})(cos\beta{})\end{array}\right]\]
as a product of two orthogonal matrices.
\[A=\left[\begin{array}{ccc}\sin{\alpha{}} & 0 & \sin{\alpha{}} \\\left(sin\ \alpha{}\right)\ (sin\beta{}) & cos\beta{} &-\left(sin\beta{}\right)\left(cos\alpha{}\right) \\-(cos\beta{})(sin\alpha{}) & sin\beta{} & (cos\alpha{})(cos\beta{})\end{array}\right]\]
as a product of two orthogonal matrices.
8 M
7 (a)
Solve the \[DE\ \ y+\int_0^ty\ dt=1-\ e^{-t}\]using Laplace transforms.
6 M
7 (b)
if 0 ? x ? ? show that-
\[ x^2= \ \frac{2}{?}\left[ \left(\frac{\pi^2}{1}-\frac{4}{1^3}\right)\sin x- \ \left(\frac{\pi^2}{2}\right)\ \sin 2x\\ \ \ \ \ \ \ +\ \left(\frac{\pi^2}{3}-\frac{4}{3^3}\right)\ \sin 3x+.....\right]\]
\[ x^2= \ \frac{2}{?}\left[ \left(\frac{\pi^2}{1}-\frac{4}{1^3}\right)\sin x- \ \left(\frac{\pi^2}{2}\right)\ \sin 2x\\ \ \ \ \ \ \ +\ \left(\frac{\pi^2}{3}-\frac{4}{3^3}\right)\ \sin 3x+.....\right]\]
6 M
7 (c)
Show that {cos nx}n?1 is an orthogonal family of functions in [ -? , ? ]. Also find the corresponding orthonormal set.
8 M
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