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[" 9.The number of ordered pairs "(alpha...

[" 9.The number of ordered pairs "(alpha,beta)," where "alpha,beta in(-pi,pi)],[" satisfying "cos(alpha-beta)=1" and "cos(alpha+beta)=(1)/(e)" is "],[[" (a) "0," (b) "1," (c) "2," (d) "4]]

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