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?
How is Cos 90°=0, Cos 0°=1 and Sin 90°=1? - Quora
How is Cos 90°=0, Cos 0°=1 and Sin 90°=1? - Quora
Unit Circle: Sine and Cosine Functions · Precalculus
stackoverflowresearcher/archimedes.txt at master
Unit Circle: Sine and Cosine Functions · Precalculus
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