To find the length of the hypotenuse \( C \) of a right triangle given the lengths of the other two sides \( A \) and \( B \), you can use the Pythagorean theorem. The formula is:
\[ C = \sqrt{A^2 + B^2} \]
However, from your question, it seems you have provided additional expressions that involve \( A^2 \) and \( B^2 \). If you are looking to express the hypotenuse simply in terms of \( A \) and \( B \), the correct formula remains:
\[ C = \sqrt{A^2 + B^2} \]
It's important to clarify that the expression \( A^2 - B^2 \) mentioned in your question does not apply directly to finding the hypotenuse of a right triangle. Instead, that expression relates to the difference of squares and is not used in the context of calculating the length of the hypotenuse.
To summarize, the expression that represents the length of the hypotenuse \( C \) is:
\[ C = \sqrt{A^2 + B^2} \]
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