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[cos(alpha-beta)=1" and "cos(alpha+beta)...

[cos(alpha-beta)=1" and "cos(alpha+beta)=1/8," where "alpha,beta in[-pi,pi]," numbers of pairs of "2,beta" which satisfy both the "],[" equations is "],[[" (A) "0," (B) "1," (C) "2," (D) "4" UEE "2005" (Screening) "]]

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