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Use the sum of angles identity sin open parentheses A plus B close parentheses equals sin A cos B plus cos A sin B to

Use the sum of angles identity sin open parentheses A plus B close parentheses equals sin A cos B plus cos A sin B to expand and simplify the expression sin open parentheses fraction numerator 2 straight pi over denominator 3 end fraction plus fraction numerator 5 straight pi over denominator 4 end fraction close parentheses

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