Find the sine and cosine values at the angle $ frac{pi}{4} $

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) = \frac{\sqrt{2}}{2}, \;\sin\left( \frac{\pi}{4} \right) = \frac{\sqrt{2}}{2} $

At the angle $ frac{pi}{4} $:

$ cosleft( frac{pi}{4}
ight) = frac{sqrt{2}}{2} $

$ sinleft( frac{pi}{4}
ight) = frac{sqrt{2}}{2} $

At $ frac{pi}{4} $:

$ cosleft( frac{pi}{4}
ight) = frac{sqrt{2}}{2}, ;sinleft( frac{pi}{4}
ight) = frac{sqrt{2}}{2} $

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