CCSS.Math.Content.HSF-TF.A.3
(+) Use special triangles to determine geometrically the values of sine, cosine, tangent for π/3, π/4 and π/6, and use the unit circle to express the values of sine, cosine, and tangent for <i>x</i>, π + <i>x</i>, and 2π – <i>x</i> in
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