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_{0}has the equation:

x(t) = A

_{0}/cos (delta)*e^(-t/tau) *cos (w't + delta)

w' is the angular frequency, tau is the time constant and delta is given by:

tan (delta) = - (1/w' tau)

find the time when the maximum negative displacement occurs. express it in terms of period.

So, Can you just give me a hint on where to start and where to go from there.

Thank you