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[" If "sin(theta+alpha)=aquad " and "quad sin(theta+beta)=b," then "],[cos2(alpha-beta)-4ab cos(alpha-beta)" is equal to "],[[" (a) "1-a^(2)-b^(2)," (b) "1-2a^(2)-2b^(2)],[" (c) "2+a^(2)+b^(2)," (d) "2-a^(2)-b^(2)]]

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