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Chapter 8: Q34P (page 444)

Evaluate each of the following definite integrals by using the Laplace transform table.

鈭�0鈭�e-2tsin3tdt=313. Hint: In (8.1), let p=2,f(t) =sin3t;use L3 with a=3.

Short Answer

Expert verified

The value of given integral 鈭�0鈭�e-2tsin3tdt=313..

Step by step solution

01

Given information.

The given pair of linear equation is 鈭�0鈭�e-2tsin3tdt..

02

Laplace transformation

Laplace transformation is a way for solving differential equations. The differential equation in the time domain is first translated into an algebraic equation in the frequency domain. The outcome of solving the algebraic equation in frequency domain is then translated to time domain form to obtain the differential equation's ultimate solution.

By the use of Laplace transformation tableL(sinat)=ap2+a2

03

Find the value of given integral equation∫0∞e-2tsin3tdt.

By the use of (L3) Laplace transformLsinat=ap2+a2

鈭�0鈭�e-2tsin3tdt=Lsin3t鈭�0鈭�e-2tsin3tdt=3p2+32

Substitute 2 for in equation (1).

鈭�0鈭�e-2tsin3tdt=313

Thus, the value of given pair of linear equation 鈭�0鈭�e-2tsin3tdtis鈭�0鈭�e-2tsin3tdt=313

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