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If cos(x-y), cosx and cos(x+y) are in H....

If `cos(x-y), cosx and cos(x+y)` are in H.P., then `|cos x sec (y)/(2)|` equals

A

`pm sqrt(2)`

B

`pm 1//sqrt(2)`

C

`pm2`

D

None of the above

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The correct Answer is:
A
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