## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

From the given statement, we have: $C=D-E+F$ We find from the figure that: $D+(-E)+F+C=0 \\ D+(-E)+F=-C \\ D-E+F=-C$, which is a contradiction to our given statement. Thus, the statement is false.