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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
TRIGONOMETRY 1 (PRECALCULUS) (2 of 54) The Unit Circle and The
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