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If cos (x-y) , cos x , cos (x+y) are th...

If `cos (x-y) , cos x , cos (x+y) ` are three distinct numbers which are in harmonic progression and ` cos x ne cos y , " then " 1+ cos y = `

A

`cos ^(2) x`

B

`-cos ^(2) x`

C

`cos ^(2) x-1`

D

`cos ^(2) x-2`

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The correct Answer is:
A
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