Which of the following statements is tru...

Which of the following statements is true?

Between any two roots of `phi(x)=0` there exists atleast one root of `phi'(x)+lambda phi(x)=0`

Between any two roots of `phi(x)=0` there exists atleast one root of `xphi'(x)+lambda(x)=0`

Between any two roots of `phi(x)=0` there exists atleast one root of `(x^(2)+1)phi'(x)+phi(x)=0`

Between any two roots of `phi(x)=0` there exists atleast one root of `phi'(x)+xphi(x)=0`

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