Question: Express the following as a function of a single angle. cos 40 cos 70 + sin 40 sin 70 cos[?]

![40° cos 70° + sin 40° sin 70° cos[?]°](https://s3.amazonaws.com/si.experts.images/answers/2024/06/665eb57114704_865665eb5710dc10.jpg)
Express the following as a function of a single angle. cos 40° cos 70° + sin 40° sin 70° cos[?]°
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