Evaluate
\frac{3}{L\left(s^{2}+6s+18\right)}
Differentiate w.r.t. L
-\frac{3}{L^{2}\left(s^{2}+6s+18\right)}
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\frac{L^{-1}\times 3}{s^{2}+6s+18}
Express L^{-1}\times \frac{3}{s^{2}+6s+18} as a single fraction.
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