What is laplacetransform sin^2(7t) ?

The answer to laplacetransform sin^2(7t) is (98)/(s(s^2+196))

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laplacetransform sin^2(7t)

laplace transform

sin^{2} (7 t)

\frac{98}{s ( s ^{2} + 196 )}

Solution steps

L {sin^{2} (7 t)}

Rewrite using trig identities

L {\frac{1}{2} - \frac{1}{2} cos (14 t)}

Use the linearity property of Laplace Transform:

For functions

f (t), g (t)

and constants

a, b : L {a \cdot f (t) + b \cdot g (t)} = a \cdot L {f (t)} + b \cdot L {g (t)}

= L {\frac{1}{2}} - \frac{1}{2} L {cos (14 t)}

L {\frac{1}{2}} : \frac{1}{2 s}

L {cos (14 t)} : \frac{s}{s ^{2} + 196}

= \frac{1}{2 s} - \frac{1}{2} \cdot \frac{s}{s ^{2} + 196}

Simplify

\frac{1}{2 s} - \frac{1}{2} \frac{s}{s ^{2} + 196} : \frac{98}{s ( s ^{2} + 196 )}

= \frac{98}{s ( s ^{2} + 196 )}

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What is laplacetransform sin^2(7t) ?
The answer to laplacetransform sin^2(7t) is (98)/(s(s^2+196))