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JEE Advanced Mathematics question

MathematicsTrigonometric Ratio and IdentitiesJEE Advanced

If then is equal to

Answer: (A)

Solution

Let . Since , i.e. , we get .

Subtracting the two relations: , so

2a-=Missing argument for \frac\frac1λ-λ .

Multiplying by : $

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Question ID VK-108441