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A man observes that when he moves up a d...

A man observes that when he moves up a distance `c` metres on a slope, the angle of depression of a point on the horizontal plane from the base of the slope is `30^0,` and when he moves up further a distance `c` metres, the angle of depression of that point is `45^0dot` The angle of inclination of the slope with the horizontal is.

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