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Solution :

Compare `x= 0.25 ( 6000 t + 0.85 ) ` with `x= A cos ( omega t + phi)` <br> (i) Period , `T= ( 2pi)/( omega ) = ( 2pi)/( 6000) s =( pi)/(3000) = 0.00105s` <br> (ii) Initial phase `, phi =0.85 rad`