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If cos(x-y),cosxa n d"cos"(x+y) are in H...

If `cos(x-y),cosxa n d"cos"(x+y)` are in H.P., then `cosxsec(y/2)=`

Text Solution

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The correct Answer is:
`+- sqrt(2)`
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Knowledge Check

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

    A
    1
    B
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    C
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    B
    `+-1//sqrt(2)`
    C
    `+-2`
    D
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  • If cos(x-y), cos x and cos(x+y) are in HP, then cos x sec (y//2) is equal to

    A
    `pm sqrt(2)`
    B
    `pm 1//sqrt(2)`
    C
    `pm2`
    D
    None of the above

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