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JEE Main 2012 Mathematics question

MathematicsSequence and SeriesJEE Main 2012

Suppose θ and ϕ(≠ 0) are such that sec(θ + ϕ), sec θ and sec(θ − ϕ) are in A.P. If for some k, then k is equal to

Answer: (1)

Solution

. So $θ -

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Question ID VK-103601