SOLUTION: cos(-1380)

Question 695869: cos(-1380)

Found 2 solutions by Alan3354, mouk:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
cos(-1380)
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Do you have a calculator?

Answer by mouk(232) (Show Source): You can put this solution on YOUR website!
The cosine function has period
So

So we can write as follows:

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