If you need to find the displacement of moving particle, under the given conditions, you need to evaluate the definite integral of the given function such that:

`s(t) = int_0^(2pi) 3cos 2t dt `

You need to come up with the following substitution such that:

`2t = u => 2dt =...

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If you need to find the displacement of moving particle, under the given conditions, you need to evaluate the definite integral of the given function such that:

`s(t) = int_0^(2pi) 3cos 2t dt `

You need to come up with the following substitution such that:

`2t = u => 2dt = du => dt = (du)/2`

`{(t = 0 => u = 0 ),(t = 2pi => u = 4pi ):}`

Changing the variable yields:

`int_0^(2pi) 3cos 2t dt = int_0^(4pi) 3cosu(du)/2`

`(3/2) int_0^(4pi) cos u du = (3/2) sin u|_0^(4pi)`

Using the fundamental theorem of calculus yields:

`(3/2) int_0^(4pi) cos u du = (3/2)(sin 4pi - sin 0) = 0`

**Hence, evaluating the distance travelled by the moving particle yields `s(t) = 0.` **