InterviewSolution
`(f^1(X))/(G^1(y)) sqrt(1 + f(x)^2))``(f^1(x))/(g^1(y)) 1/(sqrt(1 + (f(x))^2))``(f^1(x))/(g(y)) 1/(sqrt(1 + (f(x))^2))``2(f^1(x))/(g^1(y)) sqrt(1 + (f(x))^2)`
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