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Check the hypotheses of Rolle's Theorem and the mean value theorem and find a value of...

Check the hypotheses of Rolle's Theorem and the mean value theorem and find a value of c that makes the appropriate conclusion true. Illustrate the conclusion with a graph:

Prove that x^4+6x^2-1=0 has exactly two solutions

Please provide all work needed to solve the problem with explanations. Thank you!

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