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Question 1,Review Exercise

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b) $60^{\circ}$\\ * %%(c)%% $90^{\circ}$\\ * (d) $120^{\circ}$\\ <btn type="link" collapse="a12">See Answer</btn><collapse id="a12" collapsed="true">%%(c)%%: $90^{\circ}$</collapse> xiii. $2\cos 5