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[" 18.The value of "],[cos^(2)(A-B)+cos^...

[" 18.The value of "],[cos^(2)(A-B)+cos^(2)B-2cos(A-B)],[cos A cos B" is "],[[" (1) "sin A," (2) "sin^(2)A],[" (3) "cos^(2)A," (4) "cos A]]

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