Use an Addition or Subtraction Formula to Write $\sin 23 ^ { \circ } \cos 22 ^ { \circ } + \cos 23 ^ { \circ } \sin 22 ^ { \circ }$

question 106

Essay

Use an addition or subtraction formula to write $\sin 23 ^ { \circ } \cos 22 ^ { \circ } + \cos 23 ^ { \circ } \sin 22 ^ { \circ }$ and find its exact value.

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