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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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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 D ( TRANSFORMATIONS )
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