A is an angle in the fourth quadrant. It satisfies the trigonometric equation 3(3- ^2A- A)^2=1. Which one of the following is a value of A?

NDA 2018 Mathematics question

A is an angle in the fourth quadrant. It satisfies the trigonometric equation . Which one of the following is a value of A?

Answer: (A)

Test : , so and . Then and

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Question ID VK-028971