how to do a cosine in your head

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Is there an easy way to do a cosine in your head

cos(23

Guest Feb 10, 2015

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Best Answer

+118723

+5

For some angles ther is but not for 23 degrees

Melody Feb 11, 2015

1⁺⁰ Answers

+118723

+5

Best Answer

For some angles ther is but not for 23 degrees

Melody Feb 11, 2015

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