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[" If "cos(theta-alpha)=a*cos(theta-beta...

[" If "cos(theta-alpha)=a*cos(theta-beta)=b],[" then "sin^(2)(alpha-beta)+2ab cos(alpha-beta)=],[" 1) "a^(2)+b^(2)quad " 2) "a^(2)-b^(2)" 3) "b^(2)-a^(2)" 4) "-a^(2)-b^(2)]

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