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To the equation 2^2pi//cos^(-1)x-(a+1/2)...

To the equation `2^2pi//cos^(-1)x-(a+1/2)2^(pi//cos^(-1)x)-a^2=0` has only one real root, then (a)`1lt=alt=3` (b) `ageq1` (c)`alt=-3` (d) `ageq3`

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