Perform the Indicated Operations and Simplify the Result So There $$\cos 67 ^ { \circ } = \cos 13 ^ { \circ } \cos 54 ^ { \circ } - \sin 13 ^ { \circ } \sin 54 ^ { \circ }$$

question 309

True/False

Perform the indicated operations and simplify the result so there are no quotients.
- $$\cos 67 ^ { \circ } = \cos 13 ^ { \circ } \cos 54 ^ { \circ } - \sin 13 ^ { \circ } \sin 54 ^ { \circ }$$

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