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[" If "sin^(4)alpha+4cos^(4)beta+2=4sqrt...

[" If "sin^(4)alpha+4cos^(4)beta+2=4sqrt(2)sin alpha cos beta],[alpha,beta in[0,pi]," then "cos(alpha+beta)-cos(alpha-beta)],[" is equal to: "],[[" (1) "0," (2) "-sqrt(2)," (3) "-1," (4) "sqrt(2)]]

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