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Find cos0 where 0 is the angle shown

 Jan 25, 2019
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I'm not sure if this is what you're asking about but...

 

cos(0)=1

Looking at the unit circle at 0°, we see that the coordinate is at (1,0). I would recomend memorizing the coordinates of 0° or 360°, 90°, 180°, and 270°. Since cos represents the x-coordinate, this means that at (1,0) or 0°, cos(0)=1.

 Jan 25, 2019
edited by Paper  Jan 25, 2019

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