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JEE Advanced Mathematics question

MathematicsTrigonometric Ratio and IdentitiesJEE Advanced

If , then

Answer: (B),(C)

Solution

Divide by and multiply by 30: , i.e.

9 x - 12 x + 4 = 0 ⇒ (3x - = 0 ⇒ x = Missing argument for \tfrac\tfrac23.

So (c) is true and (a) () is false. Then

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Question ID VK-110721