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[=cos^(2)A," then "cos^(6)A-4cos^(4)A+8c...

[=cos^(2)A," then "cos^(6)A-4cos^(4)A+8cos^(2)A=],[" circles of radii "a" and "b(a>b)" are given.The length of the ch "],[" uler circle is "]

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