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Find the sine and cosine values at the angle pi/4

Answer 1 At the angle $ \frac{\pi}{4} $, the coordinates on the unit circle are: $ \left( \cos\left( \frac{\pi}{4} \right), \sin\left( \frac{\pi}{4} \right) \right) $ Using the unit circle values: $ \cos\left( \frac{\pi}{4} \right) =...