UPSC CDS 2 2018 Math Paper

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Question : 61 of 100

Marks: +1, -0

If cos θ =

1

√5

, where 0 < θ <

π

2

, then

2tanθ

1−tan2θ

is equal to

[2018 CDS-II]

4/3
- 4/3
1/3
- 2/3

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