Using the unit step function, find the Laplace transform of

Using the unit step function, find the Laplace transform of
f(t)= cos๐‘ก, 0 โ‰ค ๐‘ก โ‰ค ๐œ‹
cos2๐‘ก , ๐œ‹ โ‰ค ๐‘ก โ‰ค 2๐œ‹
cos3๐‘ก , ๐‘ก โ‰ฅ 2๐œ‹

Answer:-

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