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[" Purve that "],[(cos x-cos y)^(2)+(sin...

[" Purve that "],[(cos x-cos y)^(2)+(sin x-sin y)^(2)=4*sin^(2)((x-y)/(2))]

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(cos x + cos y ) ^(2) + (sin x - sin y ) ^(2) = 4 cos ^(2) ""(x + y )/( 2)

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