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.

Name: 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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The Answer of 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.

Use an Addition or Subtraction Formula to Write cos⁡12∘cos⁡18∘−sin⁡12∘sin⁡18∘\cos 12 ^ { \circ } \cos 18 ^ { \circ } - \sin 12 ^ { \circ } \sin 18 ^ { \circ }cos12∘cos18∘−sin12∘sin18∘

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