Charles runs at a rate of 12 kilometers per hour. What is Charles' speed in meters per minute? A 12 meters per minute B 20 meter
1 answer:
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It's a value you should probably memorize:
You can derive it using some trigonometric identities, other known values of cosine, and properties of the cosine function. For example, using the double angle identity for cosine:
If , then
and you probably know that , so
When we take the square root, we should take the positive root because whenever
:
