How do you find the value of cos((16pi)/3) ? Trigonometry Right Triangles Trigonometric Functions of Any Angle 1 Answer Nghi N Dec 23, 2016 - 1/2 Explanation: Use trig table of special arcs and unit circle --> cos ((16pi)/3) = cos ((-2pi)/3 + (18pi)/3) = cos ((-2pi)/3 + 6pi) = cos ((-2pi)/3) = cos ((2pi)/3) = - 1/2 Answer link Related questions How do you find the trigonometric functions of any angle? What is the reference angle? How do you use the ordered pairs on a unit circle to evaluate a trigonometric function of any angle? What is the reference angle for 140^\circ? How do you find the value of cot 300^@? What is the value of sin -45^@? How do you find the trigonometric functions of values that are greater than 360^@? How do you use the reference angles to find sin210cos330-tan 135? How do you know if sin 30 = sin 150? How do you show that (costheta)(sectheta) = 1 if theta=pi/4? See all questions in Trigonometric Functions of Any Angle Impact of this question 9841 views around the world You can reuse this answer Creative Commons License