1.

What is the LT and ROC of the signal x(t) = sin (3t) u(t)?

A. \(X\left( s \right) = \frac{3}{{{s^2} + 9}},\;Re\left( s \right) < 3\)
B. \(X\left( s \right) = \frac{3}{{{s^2} + 9}},\;Re\left( s \right) < 0\)
C. \(X\left( s \right) = \frac{3}{{{s^2} + 9}},\;Re\left( s \right) > 0\)
D. \(X\left( s \right) = \frac{3}{{{s^2} + 9}},\;Re\left( s \right) > 3 \)
Answer» D. \(X\left( s \right) = \frac{3}{{{s^2} + 9}},\;Re\left( s \right) > 3 \)


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