Q .     If `cos(x-y),cos x,cos(x+y)` are three distinct numbers in `H.P`, then the value of `(1+cosy)`?

EAMCET 2010
A

`cos^(2) x`

B

`-cos^(2) x`

C

`cos^(2) x - 1`

D

`cos^(2) x - 2`

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