This was another popular question among the candidates. Most of them were able to state the correct formula and substituted correctly. However, few had difficulty in handling sin = to obtain the value of . Some candidates manipulated sin 2 = 0.866 and got sin = 0.433 which was wrong. Some could not determine the arc sine (sin-1) of the number to arrive at the correct answer. Few candidates failed to write unit while some gave wrong unit.
The expected answer is