The Laplace transform of the product of two functions is the product of the Laplace transforms of each given function. True of False? Explain why.

CoormaBak9 2020-11-08 Answered
The Laplace transform of the product of two functions is the product of the Laplace transforms of each given function. True of False? Explain why.
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unett
Answered 2020-11-09 Author has 119 answers

Answer: False. The Laplace transform of the product of two functions is not the product of the Laplace transforms of the each given function.
Explanation: Laplace transform of a function f(t) is given by:
F(s)=0estf(t)dt
Then, for any two functions f(t) and g(t) the Laplace transform of the product of two functions is:
L{f(t)g(t)}
Integral form is: 0est[f(t)g(t)]dt
Which is not equal to 0estf(t)dt0estg(t)dt
Therefore, the given statement if false.
But, it is equal to the product of the convolution of the Laplace transforms of the each function.
If F(s) and G(s) are the Laplace transforms of the functions f(t) and g(t), then,
Laplace transform of f(t)g(t) is:
L{f(t)g(t)}=F(s)G(s)
Where, indicates convolution of the two functions, given by
fg(t)=u=0tf(u)g(tu)du
Hence, the given statement is false.

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