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• algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange

algebra precalculus - Using unit circle to explain $\cos(0) = 1$ and $\sin( 90) = 1$ - Mathematics Stack Exchange

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We have been taught $\cos(0) = 1$ and $\sin(90) = 1$. But, how do I visualize these angles on the unit circle?

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How is Cos 90°=0, Cos 0°=1 and Sin 90°=1? - Quora

3.3 Unit Circle: Sine and Cosine

Compute cos(0) by using the unit circle

Another way to remember why Sin(90°) = 1 without memorizing the