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[" If "],[qquad [(a+sqrt(2)b cos x)(a-sq...

[" If "],[qquad [(a+sqrt(2)b cos x)(a-sqrt(2)b cos y)=a^(2)],[-b^(2)],[" where "a>b>0," then "(dx)/(dy)at((pi)/(4),(pi)/(4))" is : "]]

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