The answer is given in red I don\'t understand how it isderived! HELP PLEASE! A

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The answer is given in red I don't understand how it isderived! HELP PLEASE! A ball starts smoothly rolling down a circular trough of radius R with essentially zero initial speed. At the end of the trough, the ball takes off (at this point the ball can be treated as a point particle) and lands at distance d from the trough. Express the distance d in terms of g, R and theta and check the units. Check the behavior of d when you increase (one at a time) each of R and theta. Compute the distance if R = 1m and 6 = 60 degree. How will the answer change if the ball is replaced with a cylinder? d =R *2cos theta sin(2 theta)(I +b theta)

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Help!!! please lifesaver!

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