UPSC NDA I 2015 Mathematics Solved Paper
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For the next three (3) items that follow:
Considerx = 4 t a n − 1 (
) , y = t a n − 1 (
) z = t a n − 1 (
)
Consider
[NDA I 2015]
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Question : 42 of 120
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what is x − y + z
[NDA I 2015]
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