4. For each problem below, fill in the blanks showing how the reference angle is used in connection to the unit circle and the above triangles to find the exact trig values for the common and quadrantal angles. Also, circle the correct sign: + or - a. 60° has reference angle = cos 60° = b. 210° has reference angle = cos 210° = + – cos %3D 1la has reference angle = с. %3D 117 sin = + – sin

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