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[" 25."4f(4)quad x sqrt(1+y)+y sqrt(1+x)...

[" 25."4f_(4)quad x sqrt(1+y)+y sqrt(1+x)=0,quad pi(dy)/(dx)(dy)/(dx)(dy)/(dx/9x)(7)/(e)-],[[" (1) "(1)/((1+x)^(2))," (2) "-(1)/((1+x)^(2))],[" (3) "(1)/(1+x^(2))," (4) "(1)/(3)+x^(2)+(1)/(48)x]]

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