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JEE Advanced Mathematics question

MathematicsTrigonometric Ratio and IdentitiesJEE Advanced

In a , only if the triangle is

Answer: (D)

Solution

In every triangle

A+ B+ C=1+4Missing argument for \frac\frac A2Missing argument for \frac\frac B2Missing argument for \frac\frac C2,

and since , the product of sines is positive. So holds for

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Question ID VK-108755