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[" 20.If two different tangents of "y^(2...

[" 20.If two different tangents of "y^(2)=4x" are the nomals to "x^(2)=4by," then "],[qquad [quad |b|>(1)/(root(2)(2))quad |b|<(1)/(root(2)(2))]quad |b|>(1)/(sqrt(2))quad |b|<(1)/(sqrt(2))]

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