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Need help The vertical displacement y (in cm) of the end of an industrial robot arm for each cycle is y = 4t - tan

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Need help

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The vertical displacement y (in cm) of the end of an industrial robot arm for each cycle is y = 4t - tan 0.3t, where t is the time (in s). Find its vertical velocity for t = 18s. Its vertical velocity for t= 18s is cm/s. (Round to the nearest tenth as needed.)

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