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If phi(x) is a differentiable function A...

If `phi(x)` is a differentiable function `AAx in Rand a inR^(+)` such that `phi(0)=phi(2a),phi(a)=phi(3a)and phi(0)nephi(a),` then show that there is at least one root of equation `phi'(x+a)=phi'(x)"in"(0,2a).`

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