Use an Addition or Subtraction Formula to Write $\cos 12 ^ { \circ } \cos 18 ^ { \circ } - \sin 12 ^ { \circ } \sin 18 ^ { \circ }$

question 33

Essay

Use an addition or subtraction formula to write $\cos 12 ^ { \circ } \cos 18 ^ { \circ } - \sin 12 ^ { \circ } \sin 18 ^ { \circ }$ and find its exact value.

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