A Random Picture

A pendulum oscillates harmonically in a room. A student enters the room and takes a picture of the pendulum at a random time. What is the probability that the picture will capture the pendulum in a position xx such that xAϵ=110 ? \frac{|x|}{A}\leq \epsilon=\frac{1}{10}\ \text{?} Here, xx is deviation of the pendulum from the vertical and AA is the amplitude of the oscillations.

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