how to find out cos 170°
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Find the point (1,0) and rotate counterclockwise along the unit circle 170∘, (or find the point (−1,0) and rotate clockwise around the unit circle 10∘) and the x-coordinate is cos170∘ .
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Find the point (1,0) and rotate counterclockwise along the unit circle 170∘, (or find the point (−1,0) and rotate clockwise around the unit circle 10∘) and the x-coordinate is cos170∘ .