MA19.PRE.33

Use special triangles to determine geometrically the values of sine, cosine, and tangent for $frac {pi}{3}$, $frac {pi}{4}$, and $frac {pi}{6}$, and use the unit circle to express the values of sine, cosine, and tangent for $pi - x$, $pi + x$, and $2pi - x$ in terms of their values for $x$, where $x$ is any real number.