<prompt> Find the exact value of this trigonometric expression.cosπ3  <response>: The value of cosπ3 is 12.Explanation: In trigonometry, π radians is equivalent to 180 degrees.So if we convert π3 to degrees, it becomes 180 13 60 degrees. So cosπ3 is the same as cos60.Using the unit circle, we know that the cosine of an angle is equal to the x-coordinate of the point on the unit circle that corresponds to that angle. The x, y coordinates of point on the unit circle corresponding to 60 degrees is 12, 32, so the value of cos60 or cosπ3 is 12. 