Final answer:
Without additional context or information, determining the value of the expression c8 - c12 is not possible. If they are combinatorial expressions, we would need the value of 'c' to provide an accurate response.
Step-by-step explanation:
The expression to evaluate appears to be c8 - c12. Since the context of the symbols 'c8' and 'c12' is not provided, we cannot know exactly what they refer to. They could be elements of a sequence, specific constants in a scientific formula, or something else entirely. Without additional context or information, determining the value of the given expression is not possible.
If these were meant to be combinatorial expressions (e.g., '8 choose c' or '12 choose c'), we would need to know the value of 'c' or have a combinatorial context to evaluate these expressions properly. However, since no such information is provided, an exact numerical answer cannot be delivered with the details at hand.