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Grade 11Trigonometry

Please provide me full solution
The answer given is A and C.
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7 Years agoGrade 11
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1 Answer

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7 Years ago
AI=b+c, DI=a, AI/DI=b+c/a, from sine formula, b=ksinB, c=ksinC, a=ksinA, so b+c/a=sinB+sinC/sinA.Apply sum formula and double formula. 

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