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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)=`

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

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