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Find the Laplace transform of the following functions. (a)  f (t)  =  { 7 0  < ...

Find the Laplace transform of the following functions.

(a)  f (t)  =  { 7 0  <  t  ≤  4 8 t  ≥  4

(b)  f (t)  =  { t2 0  ≤  t  <  2 0 t  ≥  2

(c)  f (t)  =  { 0 0  ≤  t  <  π/9 cos[7(t − π/9)] t  ≥  π/9

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