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Mathematics
Engineering Mathematics A foundation for Electronic, Electrical, Communications and Systems Engineers
566 SOLVED PROBLEMS
Question: 24.14
Find, if possible, (a) the Laplace transform (b) the Fourier transform of f (t ) = u(t ) e^3t . Comment upon the result. ...
Verified Answer:
(a) Either by integration, or from Table 21.1, we ...
Question: 4.11
Show that R = √x² + y² + z² ...
Verified Answer:
From Figure 4.28 x² +y² = OQ² From ΔOPQ OP² = OQ² ...
Question: 4.12
Describe the surface R = 4. ...
Verified Answer:
We have R = 4 and θ and Φ can vary across their fu...
Question: 9.7
If z1 = 2 − 2j and z2 = 3 + 4j, find z1z2. ...
Verified Answer:
z_1z_2 = (2 − 2j)(3 + 4j)
Removing ...
Question: 29.20
The continuous random variable x has a standard normal distribution. Calculate the probability that (a) x 1.2 (c) x > −1.2 (d) x < −1.2 ...
Verified Answer:
(a) From Table 29.7 P(x < 1.2) = 0.8849 This is...
Question: 24.13
Find F{sin at}. ...
Verified Answer:
Subtracting the previous expressions for
{...
Question: 24.12
Given that F{δ(t − a)} = e^−jωa find F{e^−jta}. ...
Verified Answer:
We have f(t) = δ(t − a),
F(\omega)=\mathrm...
Question: 24.11
Apply the t-ω duality principle to the previous result. Interpret the result physically. ...
Verified Answer:
We have f(t) = δ(t) and F(ω) = 1. The duality prin...
Question: 24.10
Use the properties of the delta function to deduce its Fourier transform. ...
Verified Answer:
By definition
{\mathcal{F}}\{\delta(t-a)\}=...
Question: 24.9
Given that the Fourier transform of u(t) e^−t is 1/1 + jω use the duality principle to deduce the transform of 1/1 + jt. ...
Verified Answer:
We know
{{F(\omega)}}\ =\ {\frac{1}{1+\mat...
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