What is laplacetransform 7cos(3t) ?

The answer to laplacetransform 7cos(3t) is (7s)/(s^2+9)

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laplacetransform 7cos(3t)

laplace transform

7 cos (3 t)

\frac{7 s}{s ^{2} + 9}

Solution steps

L {7 cos (3 t)}

Use the constant multiplication property of Laplace Transform:

For function

f (t)

and constant

a : L {a \cdot f (t)} = a \cdot L {f (t)}

= 7 L {cos (3 t)}

L {cos (3 t)} : \frac{s}{s ^{2} + 9}

= 7 \cdot \frac{s}{s ^{2} + 9}

Refine

7 \frac{s}{s ^{2} + 9} : \frac{7 s}{s ^{2} + 9}

= \frac{7 s}{s ^{2} + 9}

What is laplacetransform 7cos(3t) ?
The answer to laplacetransform 7cos(3t) is (7s)/(s^2+9)