Voltage is applied to the horizontally and vertically deflecting plates of the oscilloscope, leading to the deflection of the electron beam according to the law x (t) = 4cos2.5t (mm) horizontally and y (t) = 2.5sin2.5t (mm) vertically. Write the equation of the trajectory observed on the oscilloscope screen. Determine the speed of a point from the electron beam on the screen at a time when y = 0.
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