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UPSC NDA I 2016 Mathematics Solved Paper

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For the next two (2, items that follow :
Given that tanα and tanβ are the roots of the equation x2+bx+c=0 with b≠0.

[NDA I 2016]

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Question : 39

Total: 120

What is sin ( α + β) secα secβ equal to?

b
−b
c
−c

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