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

[" f "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 "],[[" (a) "-1," (b) "0," (c) "sqrt(2)," (d) "-sqrt(2)]]

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