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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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c# - I understand that Sin and Cos are in radians, but why I am
Another way to remember why Sin(90°) = 1 without memorizing the
How is Cos 90°=0, Cos 0°=1 and Sin 90°=1? - Quora
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