How do you evaluate sin(11(pi)/2) ? Trigonometry Right Triangles Trigonometric Functions of Any Angle 1 Answer Karthik G Feb 1, 2016 Explanation is given below Explanation: sin((11pi)/2) =sin(6pi-pi/2) Note color(magenta)(sin(2npi - theta) = -sin(theta) and color(magenta)(sin(2npi + theta) = sin(theta) =-sin(pi/2) =-1 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 3526 views around the world You can reuse this answer Creative Commons License