MATH SOLVE

7 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