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[" Prove that "],[[" (i) "(cos A-cos B)^...

[" Prove that "],[[" (i) "(cos A-cos B)^(2)+(sin A-sin B)^(2)=4sin^(2)(A-B)/(2)],[" (ii) "(cos x+cos y)^(2)+(sin x-sin y)^(2)=4cos^(2)(x+y)/(2)]]

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