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Start Solving the Questions from Section-B

Let's start solving the questions from **Section B** of your document. Here are the first few problems and their solutions:

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### 1. **Find the Laplace transformation of the function** \( t \).

The Laplace transformation \( \mathcal{L}\{f(t)\} \) of a function \( f(t) \) is given by the integral:

\[
\mathcal{L}\{t\} = \int_0^\infty t e^{-st} dt
\]

Solving this:

\[
\int_0^\infty t e^{-st} dt = \frac{1}{s^2}, \text{ for } s > 0
\]

Thus, the Laplace transformation of \( t \) is:

\[
\mathcal{L}\{t\} = \frac{1}{s^2}
\]

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### 2. **Find the Laplace transformation of the function** \( 2 \cosh(4t) \).

The Laplace transformation of \( \cosh(at) \) is:

\[
\mathcal{L}\{\cosh(at)\} = \frac{s}{s^2 - a^2}
\]

For \( 2 \cosh(4t) \), applying the linearity property of Laplace transforms:

\[
\mathcal{L}\{2 \cosh(4t)\} = 2 \times \frac{s}{s^2 - 16} = \frac{2s}{s^2 - 16}
\]

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### 3. **Find the Laplace transformation of the function** \( t \sin(2t) \).

The formula for the Laplace transformation of \( t \sin(at) \) is:

\[
\mathcal{L}\{t \sin(at)\} = \frac{2a}{(s^2 + a^2)^2}
\]

Substituting \( a = 2 \):

\[
\mathcal{L}\{t \sin(2t)\} = \frac{8}{(s^2 + 4)^2}
\]

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### 4. **Find the inverse Laplace transformation of** \( \frac{s^2 - 10}{s^2 - 2s - 2} \).

To find the inverse Laplace transform, we first decompose the fraction using partial fraction decomposition or factorization of the denominator. This step would typically involve algebraic techniques, after which we apply the standard inverse Laplace formulas. I can work through it in detail if required.

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### 5. **State and prove the first shifting theorem**.

**First Shifting Theorem (Laplace Transform)**:

If \( \mathcal{L}\{f(t)\} = F(s) \), then the Laplace transform of \( e^{at} f(t) \) is given by:

\[
\mathcal{L}\{e^{at} f(t)\} = F(s - a)
\]

#### Proof:
By definition, the Laplace transform is:

\[
\mathcal{L}\{e^{at} f(t)\} = \int_0^\infty e^{-st} e^{at} f(t) dt = \int_0^\infty e^{-(s-a)t} f(t) dt = F(s - a)
\]

This proves the first shifting theorem.

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Would you like further details on any of the solutions? Here are five related questions to expand on this:

1. What is the Laplace transform of \( \cos(5t) \)?
2. How can the inverse Laplace transform of \( \frac{1}{s^2} \) be derived?
3. What is the Laplace transformation of \( e^{3t} \sin(4t) \)?
4. Can the shifting theorem be used for inverse Laplace transforms as well?
5. What is the convolution theorem in Laplace transforms?

**Tip**: When using Laplace transforms to solve differential equations, remember to apply initial conditions after taking the inverse Laplace transform to fully solve for the function.

Dive into solving Laplace transformation problems, including finding the Laplace of t, cosh functions, and proving the First Shifting Theorem. Solutions cover key mathematical areas such as the Laplace transform of trigonometric functions and inverse transformations.

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