If Cos (θ – α), Cos θ and Cos (θ + α) Are In Harmonic Progression, Then Cosθ sec (α/2) Is Equal To

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Question

If cos (θ – α), cos θ and cos (θ + α) are in harmonic progression, then cosθ sec (α/2) is equal to

2
1/2
– 1/2

easy

Solution

Correct option is

Since cos (θ – α), cos θ and cos (θ + α) are in H.P., we have

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