JEE Advanced Mathematics question

MathematicsTrigonometric Ratio and IdentitiesJEE Advanced

In a , . If and satisfy the equation , , then is

Answer: (C)

Solution

The condition means , i.e. . With :

3A=3B⇒ 3A=(2n+1)π-3B or 3A=3B+2nπ.

- First family: ; since , and . (Valid:

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Question ID VK-108708