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A particle is at rest, It starts rotatin...

A particle is at rest, It starts rotating about a fixed point. Its angle of rotation `(theta)` with time (t) is given by the relation :
`theta = (6t^3)/(15) - (t^2)/(2)`
where `theta` is in radian and t is seconds. Find the angular velocity and angular acceleration of a particle at the end of 6 second.

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