16. 0< V2+12+12+2 cos 80 =k cose=k= 224 38 40 16 1) 2

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( 2+2 cos 80 ) ( 2(1+cos theta theta)= ) ( 4 cos ^{2} 4 theta ) ( 2 sqrt{2+sqrt{2+2 cos ^{2} 4 theta}} ) ( =sqrt{2+2 cos 2 theta} ) ( 2 cos theta ) 2 ( frac{214 cos 0}{k=2} )

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