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[" Suppose that for some angles "x" and ...

[" Suppose that for some angles "x" and "y" the equations "],[sin^(2)x+cos^(2)y=(3a)/(2),cos^(2)x+sin^(2)y=(a^(2))/(2)" hold simultaneously then the "],[" value of "cos2x-cos2y" equals "]

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