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For alpha ne 0, " if "cos(theta+alpha),...

For `alpha ne 0, " if "cos(theta+alpha), costheta " and "cos(theta-alpha)` are in harmonic progression, then `sec^(2)theta*cos^(2)""alpha/2=`

A

2

B

1

C

`1/2`

D

`1/4`

Text Solution

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The correct Answer is:
C
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