Final answer:
Analytic truths can be doubted by questioning the definitions or concepts upon which they are based.
Step-by-step explanation:
Analytic truth refers to statements that are true by definition and can be known without relying on empirical evidence. However, it is possible to doubt analytic truths if one questions the definitions or concepts upon which these truths are based. \\
For example, one may doubt the analytic truth that a triangle has three sides if they challenge the definition of a triangle or the concept of sides. Doubting analytic truths requires examining the underlying definitions and concepts.