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UPSC NDA I 2015 Mathematics Solved Paper

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For the next two(2) items that follow:
Let α be the root of the equation 25cos2θ+5‌cos‌θ−12=c, where ‌

π

2

<α<π.

[NDA I 2015]

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Question : 33

Total: 120

What is tan‌α equal to ?

−3/4
3
4
−4/3
−4/5

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