f(t)=3sin(t)+5cos(3t)

i am not familiar with laplace of sin and cos functions

anyone help?

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- Dec 2nd 2009, 11:19 AMjecowaplaplace tranforms of sin and cos???
f(t)=3sin(t)+5cos(3t)

i am not familiar with laplace of sin and cos functions

anyone help? - Dec 2nd 2009, 11:35 AMHaven
Table of Laplace Transforms

Particularly,

- Jan 15th 2010, 09:07 AMmabel lizzy
Ive just tried to answer the question ...I would like to know if the answer i found is right..

Qn: laplace of (f(t)=3sin(t)+5cos(3t))

L{f(t)}=3L{sin(t)}+5L{cos(3t)}

=3(1/(s^2+1))+5(s/(s^2+9))

On further simplification

=5s^3+3s^2+5s+27/(s^2+1)(s^2+9)