Descartes' method is both a method of doubt and a method of inquiry.

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Descartes' method involves doubting everything that can be doubted, including sensory experiences and even one's own existence, in order to find an indubitable foundation for knowledge. Through this process of doubt, he arrives at the conclusion "I think, therefore I am," which becomes the starting point for his inquiry into the nature of reality. Thus, the method is both a method of doubt and a method of inquiry.

Descartes' Method Is Both a Method of Doubt and a Method