A recipe calls for 4 carrots for every 2 cups of water. Which expression can be used to find the number of carrots needed for 1
2 answers:
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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
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