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How to find the value of cos (-1380°)
10 months ago
Q:
How to find the value of cos (-1380°)
Accepted Solution
A:
cos(−1380)Find an angle that is coterminal to −1380A=60°A=60°Find the value using the definition of cosine.cos(60)=adjacent/hypotenusecos(60)=adjacent/hypotenuseSubstitute the values into the definition.cos(60)=121cos(60)=121Simplify the result.12