00:01
Hello students, the given function is f of s equal to s by s square plus 36 into s square plus 64.
00:16
So, this is equal to s by s plus 6i into s minus 6i and s plus 8i into s minus 8i.
00:29
We can factor out this.
00:32
So, this is equal to by partial fraction decomposition we can write it as a by s plus 6i plus b by s minus 6i plus c by s plus 8i plus d by s minus 8i.
00:58
By using partial fraction decomposition, partial fraction decomposition we have, we have a equal to 1 by 9, b equal to minus 1 by 9, c equal to minus 1 by 13 and d equal to 1 by 13.
01:29
So, the partial fraction is f of s equal to 1 by 9 into s plus 6i minus 1 by 9 into s minus 6i minus 1 by 13 into s plus 8i plus 1 by 13 into s minus 8i.
01:56
So, the laplace transformation is f of t equal to 1 by 9 to e to the power minus 6i t minus 1 by 9 into e to the power minus 6i t minus 1 by 13 into e to the power minus 8i t plus 1 by 13 into e to the power 8i t.
02:22
So, this is equal to 1 by 9 into cos 60 minus cos 80 minus 1 by 13 into cos 80 plus cos 60...