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A set of traffic lights hangs from the end of a metal cable. A horizontal chain pulls the traffic
lights to the right so that they are above the middle of the road. Fig. 1.1 shows the metal
cable inclined to the vertical.

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A set of traffic lights hangs from the end of a metal cable A horizontal chain pulls the trafficlights to the right so that they are above the middle of the roa class=


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