Two quick, basic problems about cosine and sine values on the unit circle
Cosine and sine values on the unit circle is a free educational video by David Metzler.It helps students in grades 9,10,11,12 practice the following standards HSF.TF.A.3.
1. 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 x, π + x, and 2π - x in terms of their values for x, where x is any real number..
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