machine is subjected to the motion z(t) = A cos (57t+a) mm. the initial conditions are given by z (0) = 2.85 mm and dz/dt (0) = 1.0 mm/s.Find the constants A and a; Express the motion in the form z (t) = A1 cos ? t + A2 sin ? t, and identify the constants A1 and A2.

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