"the axis of a light in a lighthouse is tilted. when the light points east, it is inclined upward at 1 degree(s). when it points north, it is inclined upward at 2 degree(s). what is its maximum angle of elevation? (hint: the maximum angle of elevation of plane of the beam above the horizontal plane is the same as the angle between the normal to the plane of the beam and the normal to the horizontal plane.)"
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